103-402: [REDACTED] The West Fourth Street–Washington Square station (also known as the West Fourth Street station ) is an express station and transfer stop on the IND Sixth Avenue and IND Eighth Avenue Lines of the New York City Subway , located at the intersection of West Fourth Street and Sixth Avenue (Avenue of the Americas) in Greenwich Village , Manhattan . It is served by
206-695: A canal . The central portions of a rapid transit network are usually in the tunnel. Some tunnels are used as sewers or aqueducts to supply water for consumption or for hydroelectric stations. Utility tunnels are used for routing steam, chilled water, electrical power or telecommunication cables, as well as connecting buildings for convenient passage of people and equipment. Secret tunnels are built for military purposes, or by civilians for smuggling of weapons , contraband , or people . Special tunnels, such as wildlife crossings , are built to allow wildlife to cross human-made barriers safely. Tunnels can be connected together in tunnel networks . A tunnel
309-525: A pylon station . The first deep column station in the world is Mayakovskaya , opened in 1938 in Moscow. One variety of column station is the "column-wall station". In such stations, some of the spaces between the columns are replaced with walls. In this way, the resistance to earth pressure is improved in difficult ground environments. Examples of such stations in Moscow are Krestyanskaya Zastava and Dubrovka . In Saint Petersburg , Komendantsky Prospekt
412-564: A disabled or troubled train. A subway station may provide additional facilities, such as toilets , kiosks and amenities for staff and security services, such as Transit police . Some metro stations are interchanges , serving to transfer passengers between lines or transport systems. The platforms may be multi-level. Transfer stations handle more passengers than regular stations, with additional connecting tunnels and larger concourses to reduce walking times and manage crowd flows. In some stations, especially where trains are fully automated ,
515-449: A large factor in the decision making process. Civil engineers usually use project management techniques for developing a major structure. Understanding the amount of time the project requires, and the amount of labor and materials needed is a crucial part of project planning. The project duration must be identified using a work breakdown structure and critical path method . Also, the land needed for excavation and construction staging, and
618-716: A mezzanine. The Eighth Avenue Line platforms on the upper level opened on September 10, 1932, as part of the IND's first segment, while the Sixth Avenue Line platforms on the lower level opened on December 15, 1940. The West Fourth Street station contains elevators, which make it compliant with the Americans with Disabilities Act of 1990 . The station is listed on the National Register of Historic Places . New York City mayor John Francis Hylan 's original plans for
721-467: A pipe jack, with the span of some box jacks in excess of 20 metres (66 ft). A cutting head is normally used at the front of the box being jacked, and spoil removal is normally by excavator from within the box. Recent developments of the Jacked Arch and Jacked deck have enabled longer and larger structures to be installed to close accuracy. There are also several approaches to underwater tunnels,
824-497: A preexisting railway land corridor is re-purposed for rapid transit. At street level the logo of the metro company marks the entrances/exits of the station. Usually, signage shows the name of the station and describes the facilities of the station and the system it serves. Often there are several entrances for one station, saving pedestrians from needing to cross a street and reducing crowding. A metro station typically provides ticket vending and ticket validating systems. The station
927-559: A result, negotiations between the city and the H&;M continued for several years. The IND and H&M finally came to an agreement in 1930. The city had decided to build the IND Sixth Avenue Line's local tracks around the pre-existing H&M tubes, and add express tracks for the IND underneath the H&M tubes at a later date. The Midtown section of the Sixth Avenue Line did not begin construction until March 1936. The line
1030-421: A specialized method called clay-kicking for digging tunnels in clay-based soils. The clay-kicker lies on a plank at a 45-degree angle away from the working face and rather than a mattock with his hands, inserts with his feet a tool with a cup-like rounded end, then turns the tool with his hands to extract a section of soil, which is then placed on the waste extract. Clay-kicking is a specialized method developed in
1133-432: A station may be elevated above a road, or at ground level depending on the level of the train tracks. The physical, visual and economic impact of the station and its operations will be greater. Planners will often take metro lines or parts of lines at or above ground where urban density decreases, extending the system further for less cost. Metros are most commonly used in urban cities, with great populations. Alternatively,
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#17327658650981236-434: A tube can be sunk into a body of water, which is called an immersed tunnel. Cut-and-cover is a simple method of construction for shallow tunnels where a trench is excavated and roofed over with an overhead support system strong enough to carry the load of what is to be built above the tunnel. There are two basic forms of cut-and-cover tunnelling: Shallow tunnels are often of the cut-and-cover type (if under water, of
1339-747: A tunnel than a sufficiently strong bridge). Some water crossings are a mixture of bridges and tunnels, such as the Denmark to Sweden link and the Chesapeake Bay Bridge-Tunnel in Virginia . There are particular hazards with tunnels, especially from vehicle fires when combustion gases can asphyxiate users, as happened at the Gotthard Road Tunnel in Switzerland in 2001. One of the worst railway disasters ever,
1442-432: A tunnel. Bridges usually require a larger footprint on each shore than tunnels. In areas with expensive real estate, such as Manhattan and urban Hong Kong , this is a strong factor in favor of a tunnel. Boston's Big Dig project replaced elevated roadways with a tunnel system to increase traffic capacity, hide traffic, reclaim land, redecorate, and reunite the city with the waterfront. The 1934 Queensway Tunnel under
1545-740: A whole is usually called a "metro" or "subway". A station provides a means for passengers to purchase tickets , board trains, and evacuate the system in the case of an emergency. In the United Kingdom, they are known as underground stations , most commonly used in reference to the London Underground . The location of a metro station is carefully planned to provide easy access to important urban facilities such as roads, commercial centres, major buildings and other transport nodes . Most stations are located underground, with entrances/exits leading up to ground or street level. The bulk of
1648-416: Is a type of subway station consisting of a central hall with two side halls connected by ring-like passages between a row of columns. Depending on the type of station, the rings transmit load to the columns either by "wedged arches" or through Purlins , forming a "column-purlin complex". The fundamental advantage of the column station is the significantly greater connection between the halls, compared with
1751-410: Is an example. The pylon station is a type of deep underground subway station. The basic distinguishing characteristic of the pylon station is the manner of division of the central hall from the station tunnels The pylon station consists of three separate halls, separated from each other by a row of pylons with passages between them. The independence of the halls allows the architectural form of
1854-493: Is at the expense of character. Metro stations usually feature prominent poster and video advertising, especially at locations where people are waiting, producing an alternative revenue stream for the operator . The shallow column station is a type of construction of subway stations, with the distinguishing feature being an abundance of supplementary supports for the underground cavity. Most designs employ metal columns or concrete and steel columns arranged in lines parallel to
1957-787: Is decorated with tiles spelling the Déclaration des Droits de l'Homme et du Citoyen . Every metro station in Valencia , Spain has a different sculpture on the ticket-hall level. Alameda station is decorated with fragments of white tile, like the dominant style of the Ciutat de les Arts i les Ciències . Each of the original four stations in the Olympic Green on Line 8 of the Beijing Subway are decorated in Olympic styles, while
2060-422: Is divided into an unpaid zone connected to the street, and a paid zone connected to the train platforms. The ticket barrier allows passengers with valid tickets to pass between these zones. The barrier may be operated by staff or more typically with automated turnstiles or gates that open when a transit pass is scanned or detected. Some metro systems dispense with paid zones and validate tickets with staff in
2163-502: Is dug through surrounding soil, earth or rock, or laid under water, and is usually completely enclosed except for the two portals common at each end, though there may be access and ventilation openings at various points along the length. A pipeline differs significantly from a tunnel, though some recent tunnels have used immersed tube construction techniques rather than traditional tunnel boring methods. A tunnel may be for foot or vehicular road traffic , for rail traffic, or for
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#17327658650982266-550: Is famous for its Art Nouveau station entrances; while the Athens Metro is known for its display of archeological relics found during construction. However, it is not always the case that metro designers strive to make all stations artistically unique. Sir Norman Foster 's new system in Bilbao , Spain uses the same modern architecture at every station to make navigation easier for the passenger, though some may argue that this
2369-505: Is intended to carry both the Istanbul metro and a two-level highway, over a length of 6.5 km (4.0 miles). The French A86 Duplex Tunnel [ fr ] in west Paris consists of two bored tunnel tubes, the eastern one of which has two levels for light motorized vehicles, over a length of 10 km (6.2 miles). Although each level offers a physical height of 2.54 m (8.3 ft), only traffic up to 2 m (6.6 ft) tall
2472-658: Is only one vault (hence the name). The first single-vault stations were built in Leningrad in 1975: Politekhnicheskaya and Ploshchad Muzhestva . Not long after, the first two-level single-vault transfer stations were opened in Washington DC in 1976: L'Enfant Plaza , Metro Center and Gallery Place . In the Moscow Metro there is only one deep underground single-vault station, Timiryazevskaya , in addition to several single-vault stations at shallow depth. In
2575-430: Is relatively long and narrow; the length is often much greater than twice the diameter , although similar shorter excavations can be constructed, such as cross passages between tunnels. The definition of what constitutes a tunnel can vary widely from source to source. For example, in the United Kingdom, a road tunnel is defined as "a subsurface highway structure enclosed for a length of 150 metres (490 ft) or more." In
2678-401: Is sometimes necessary during the excavation of a tunnel. They are usually circular and go straight down until they reach the level at which the tunnel is going to be built. A shaft normally has concrete walls and is usually built to be permanent. Once the access shafts are complete, TBMs are lowered to the bottom and excavation can start. Shafts are the main entrance in and out of the tunnel until
2781-515: Is that the open building pit is muted after tunnel construction; no roof is placed. Some tunnels are double-deck, for example, the two major segments of the San Francisco–Oakland Bay Bridge (completed in 1936) are linked by a 160-metre (540 ft) double-deck tunnel section through Yerba Buena Island , the largest-diameter bored tunnel in the world. At construction this was a combination bidirectional rail and truck pathway on
2884-698: Is the Siloam Tunnel , built in Jerusalem by the kings of Judah around the 8th century BC. Another tunnel excavated from both ends, maybe the second known, is the Tunnel of Eupalinos , which is a tunnel aqueduct 1,036 m (3,400 ft) long running through Mount Kastro in Samos , Greece. It was built in the 6th century BC to serve as an aqueduct . In Ethiopia , the Siqurto foot tunnel , hand-hewn in
2987-468: The A at all times except late nights, while the Eighth Avenue Line's local tracks are used by the A at night, the C at all times except late nights, and the E at all times. The Sixth Avenue Line's express tracks are used by the B on weekdays during the day and the D at all times. The Sixth Avenue Line's local tracks are used by the F at all times, the <F> during rush hours in
3090-526: The A , D , E , and F trains at all times; the B and M trains on weekdays; the C train at all times except late nights; and the <F> train during rush hours in the peak direction. The West Fourth Street station was built as an express station for the Independent Subway System (IND)'s Sixth Avenue and Eighth Avenue Lines. It has four island platforms and eight tracks, split evenly across two levels, which are connected by
3193-569: The Balvano train disaster , was caused by a train stalling in the Armi tunnel in Italy in 1944, killing 426 passengers. Designers try to reduce these risks by installing emergency ventilation systems or isolated emergency escape tunnels parallel to the main passage. Government funds are often required for the creation of tunnels. When a tunnel is being planned or constructed, economics and politics play
West Fourth Street–Washington Square station - Misplaced Pages Continue
3296-695: The Independent Subway System (IND), proposed in 1922, included building over 100 miles (160 km) of new lines and taking over nearly 100 miles (160 km) of existing lines, which would compete with the Interborough Rapid Transit Company (IRT) and the Brooklyn–Manhattan Transit Corporation (BMT), the two major subway operators of the time. On December 9, 1924, the New York City Board of Transportation (BOT) gave preliminary approval for
3399-477: The Mexico City Metro is prominently identified by a unique icon in addition to its name, because the city had high illiteracy rates at the time the system was designed. Some metro systems, such as those of Naples , Stockholm , Moscow , St. Petersburg , Tashkent , Kyiv , Montreal , Lisbon , Kaohsiung and Prague are famous for their beautiful architecture and public art . The Paris Métro
3502-684: The Montreal Metro . In Prague Metro , there are two underground stations built as single-vault, Kobylisy and Petřiny . In the Bucharest Metro , Titan station is built in this method. The cavern station is a metro station built directly inside a cavern . Many stations of the Stockholm Metro , especially on the Blue line, were built in man-made caverns; instead of being enclosed in a tunnel, these stations are built to expose
3605-570: The Moscow Metro , typical pylon station are Kievskaya-Koltsevaya , Smolenskaya of the Arbatsko-Pokrovskaya line, Oktyabrskaya-Koltsevaya , and others. In the Saint Petersburg Metro , pylon stations include Ploshchad Lenina , Pushkinskaya , Narvskaya , Gorkovskaya , Moskovskie Vorota , and others. The construction of a single-vault station consists of a single wide and high underground hall, in which there
3708-561: The Nizhny Novgorod Metro there are four such stations: Park Kultury , Leninskaya , Chkalovskaya and Kanavinskaya . In the Saint Petersburg Metro all single-vault stations are deep underground, for example Ozerki , Chornaya Rechka , Obukhovo , Chkalovskaya , and others. Most of the underground stations of the Washington, D.C.'s Metro system are single-vault designs, as are all the single-line vaulted stations in
3811-471: The Port Authority of New York and New Jersey was not aware of this bill and had not asked for a grant for such a project. Increased taxes to finance a large project may cause opposition. Tunnels are dug in types of materials varying from soft clay to hard rock. The method of tunnel construction depends on such factors as the ground conditions, the groundwater conditions, the length and diameter of
3914-848: The Queens-Midtown Tunnel between Manhattan and the borough of Queens on Long Island ; the Detroit-Windsor Tunnel between Michigan and Ontario ; and the Elizabeth River tunnels between Norfolk and Portsmouth, Virginia ; the 1934 River Mersey road Queensway Tunnel ; the Western Scheldt Tunnel , Zeeland, Netherlands; and the North Shore Connector tunnel in Pittsburgh, Pennsylvania . The Sydney Harbour Tunnel
4017-472: The River Mersey at Liverpool was chosen over a massively high bridge partly for defense reasons; it was feared that aircraft could destroy a bridge in times of war, not merely impairing road traffic but blocking the river to navigation. Maintenance costs of a massive bridge to allow the world's largest ships to navigate under were considered higher than for a tunnel. Similar conclusions were reached for
4120-679: The United Kingdom of digging tunnels in strong clay-based soil structures. This method of cut and cover construction required relatively little disturbance of property during the renewal of the United Kingdom's then ancient sewerage systems. It was also used during the First World War by Royal Engineer tunnelling companies placing mines beneath German lines, because it was almost silent and so not susceptible to listening methods of detection. Tunnel boring machines (TBMs) and associated back-up systems are used to highly automate
4223-610: The canton of Glarus . The borehole has a diameter of 8.03 metres (26.3 ft). The four TBMs used for excavating the 57-kilometre (35 mi) Gotthard Base Tunnel , in Switzerland , had a diameter of about 9 metres (30 ft). A larger TBM was built to bore the Green Heart Tunnel (Dutch: Tunnel Groene Hart) as part of the HSL-Zuid in the Netherlands, with a diameter of 14.87 metres (48.8 ft). This in turn
West Fourth Street–Washington Square station - Misplaced Pages Continue
4326-489: The water table . This pressurizes the ground ahead of the TBM cutter head to balance the water pressure. The operators work in normal air pressure behind the pressurized compartment, but may occasionally have to enter that compartment to renew or repair the cutters. This requires special precautions, such as local ground treatment or halting the TBM at a position free from water. Despite these difficulties, TBMs are now preferred over
4429-689: The 16th century as a metaphor for a narrow, confined space like the inside of a cask. Some of the earliest tunnels used by humans were paleoburrows excavated by prehistoric mammals. Much of the early technology of tunneling evolved from mining and military engineering . The etymology of the terms "mining" (for mineral extraction or for siege attacks ), " military engineering ", and " civil engineering " reveals these deep historic connections. Predecessors of modern tunnels were adits that transported water for irrigation , drinking, or sewerage . The first qanats are known from before 2000 BC. The earliest tunnel known to have been excavated from both ends
4532-539: The 1960s and 1970s, but in Saint Petersburg , because of the difficult soil conditions and dense building in the centre of the city this was impossible. The Saint Petersburg Metro has only five shallow-depth stations altogether, with three of them having the column design: Avtovo , Leninsky Prospekt , and Prospekt Veteranov . The first of these is less typical, as it is buried at a significant depth, and has only one surface vestibule. A deep column station
4635-638: The 1960s. The main idea of this method is to use the geological stress of the surrounding rock mass to stabilize the tunnel, by allowing a measured relaxation and stress reassignment into the surrounding rock to prevent full loads becoming imposed on the supports. Based on geotechnical measurements, an optimal cross section is computed. The excavation is protected by a layer of sprayed concrete, commonly referred to as shotcrete . Other support measures can include steel arches, rock bolts, and mesh. Technological developments in sprayed concrete technology have resulted in steel and polypropylene fibers being added to
4738-716: The 1971 Kingsway Tunnel under the Mersey. In Hampton Roads, Virginia , tunnels were chosen over bridges for strategic considerations; in the event of damage, bridges might prevent US Navy vessels from leaving Naval Station Norfolk . Water-crossing tunnels built instead of bridges include the Seikan Tunnel in Japan; the Holland Tunnel and Lincoln Tunnel between New Jersey and Manhattan in New York City ;
4841-542: The IND Eighth Avenue Line began in 1925. Most of the Eighth Avenue Line was dug using a cheap cut-and-cover method. The West 4th Street station was to be one of three Eighth Avenue Line stations underneath Sixth Avenue in Lower Manhattan; the other two stations were to be at Spring Street and Walker Street . As part of the construction of the Eighth Avenue Line in Lower Manhattan, Sixth Avenue
4944-611: The IND Sixth Avenue Line, was approved in 1925, running from Midtown Manhattan underneath Sixth Avenue, Houston Street , Essex Street , and the Rutgers Street Tunnel to Downtown Brooklyn. The IND Sixth Avenue Line was designed to replace the elevated IRT Sixth Avenue Line . The transfer hub between the Eighth Avenue and Sixth Avenue lines, at Sixth Avenue and West 4th Street in Greenwich Village ,
5047-709: The Middle Ages, crosses a mountain ridge. In the Gaza Strip , the network of tunnels was used by Jewish strategists as rock-cut shelters, in first links to Judean resistance against Roman rule in the Bar Kokhba revolt during the 2nd century AD. A major tunnel project must start with a comprehensive investigation of ground conditions by collecting samples from boreholes and by other geophysical techniques. An informed choice can then be made of machinery and methods for excavation and ground support, which will reduce
5150-599: The United States, the NFPA definition of a tunnel is "An underground structure with a design length greater than 23 m (75 ft) and a diameter greater than 1,800 millimetres (5.9 ft)." The word "tunnel" comes from the Middle English tonnelle , meaning "a net", derived from Old French tonnel , a diminutive of tonne ("cask"). The modern meaning, referring to an underground passageway, evolved in
5253-654: The West Fourth Street station. The contract for the line was awarded to Corson Construction in January 1929, and work officially started in May 1929. The Houston–Essex Street Line opened on January 1, 1936. Two local tracks split from a junction with the Eighth Avenue Line south of West Fourth Street–Washington Square, running east under Houston Street and south under Essex Street to a temporary terminal at East Broadway . The E train, which had traveled to Chambers Street,
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#17327658650985356-483: The bedrock in which they are excavated. The Stockholm Metro also has a depot facility built in a cavern system. In the Hong Kong MTR , examples of stations built into caverns include Tai Koo station on Hong Kong Island , Other examples in the city include Sai Wan Ho, Sai Ying Pun, Hong Kong University and Lei Tung stations. Cut-and-cover A tunnel is an underground or undersea passageway. It
5459-400: The blocky nature of rocks, the exact location of fault zones, or the stand-up times of softer ground. This may be a particular concern in large-diameter tunnels. To give more information, a pilot tunnel (or "drift tunnel") may be driven ahead of the main excavation. This smaller tunnel is less likely to collapse catastrophically should unexpected conditions be met, and it can be incorporated into
5562-444: The central and side halls to be differentiated. This is especially characteristic in the non-metro Jerusalem–Yitzhak Navon railway station , constructed as a pylon station due to its 80-meter depth, where the platform halls are built to superficially resemble an outdoor train station. Building stations of the pylon type is preferable in difficult geological situations, as such a station is better able to oppose earth pressure. However,
5665-502: The concrete mix to improve lining strength. This creates a natural load-bearing ring, which minimizes the rock's deformation . By special monitoring the NATM method is flexible, even at surprising changes of the geomechanical rock consistency during the tunneling work. The measured rock properties lead to appropriate tools for tunnel strengthening . In pipe jacking , hydraulic jacks are used to push specially made pipes through
5768-538: The construction of the IND Eighth Avenue Line . This line consisted of a corridor connecting Inwood, Manhattan , to Downtown Brooklyn , running largely under Eighth Avenue but also paralleling Greenwich Avenue and Sixth Avenue in Lower Manhattan. The BOT announced a list of stations on the new line in February 1928, with an express station at Fourth Street and Sixth Avenue. An additional line,
5871-597: The downtown stations are decorated traditionally with elements of Chinese culture. On the Tyne and Wear Metro , the station at Newcastle United 's home ground St James' Park is decorated in the clubs famous black and white stripes. Each station of the Red Line and Purple Line subway in Los Angeles was built with different artwork and decorating schemes, such as murals, tile artwork and sculptural benches. Every station of
5974-452: The entire platform is screened from the track by a wall, typically of glass, with automatic platform-edge doors (PEDs). These open, like elevator doors, only when a train is stopped, and thus eliminate the hazard that a passenger will accidentally fall (or deliberately jump ) onto the tracks and be run over or electrocuted . Control over ventilation of the platform is also improved, allowing it to be heated or cooled without having to do
6077-409: The entire tunnelling process, reducing tunnelling costs. In certain predominantly urban applications, tunnel boring is viewed as a quick and cost-effective alternative to laying surface rails and roads. Expensive compulsory purchase of buildings and land, with potentially lengthy planning inquiries, is eliminated. Disadvantages of TBMs arise from their usually large size – the difficulty of transporting
6180-771: The express tracks at the Broadway–Lafayette Street station one stop south to the Manhattan Bridge . On July 1, 1968, another section of the Chrystie Street Connection opened, allowing Sixth and Eighth Avenue local trains to use the Williamsburg Bridge . The Williamsburg Bridge connection has been used by the M train since 2010. The Sixth Avenue Line station was also served by the JFK Express from 1978 to 1990 when it
6283-441: The final tunnel or used as a backup or emergency escape passage. Alternatively, horizontal boreholes may sometimes be drilled ahead of the advancing tunnel face. Other key geotechnical factors: For water crossings, a tunnel is generally more costly to construct than a bridge. However, both navigational and traffic considerations may limit the use of high bridges or drawbridges intersecting with shipping channels, necessitating
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#17327658650986386-453: The former USSR there is currently only one such station: Arsenalna in Kyiv . In Jerusalem, two planned underground heavy rail stations, Jerusalem–Central and Jerusalem–Khan , will be built this way. In Moscow, there were such stations, but they have since been rebuilt: Lubyanka and Chistiye Prudy are now ordinary pylon stations, and Paveletskaya-Radialnaya is now a column station. In
6489-405: The ground behind a TBM or shield. This method is commonly used to create tunnels under existing structures, such as roads or railways. Tunnels constructed by pipe jacking are normally small diameter bores with a maximum size of around 3.2 metres (10 ft). Box jacking is similar to pipe jacking, but instead of jacking tubes, a box-shaped tunnel is used. Jacked boxes can be a much larger span than
6592-640: The immersed-tube type), while deep tunnels are excavated, often using a tunnelling shield . For intermediate levels, both methods are possible. Large cut-and-cover boxes are often used for underground metro stations, such as Canary Wharf tube station in London. This construction form generally has two levels, which allows economical arrangements for ticket hall, station platforms, passenger access and emergency egress, ventilation and smoke control, staff rooms, and equipment rooms. The interior of Canary Wharf station has been likened to an underground cathedral, owing to
6695-435: The inevitable smoke and steam. A major disadvantage of cut-and-cover is the widespread disruption generated at the surface level during construction. This, and the availability of electric traction, brought about London Underground's switch to bored tunnels at a deeper level towards the end of the 19th century. Prior to the replacement of manual excavation by the use of boring machines, Victorian tunnel excavators developed
6798-468: The large TBM to the site of tunnel construction, or (alternatively) the high cost of assembling the TBM on-site, often within the confines of the tunnel being constructed. There are a variety of TBM designs that can operate in a variety of conditions, from hard rock to soft water-bearing ground. Some TBMs, the bentonite slurry and earth-pressure balance types, have pressurized compartments at the front end, allowing them to be used in difficult conditions below
6901-409: The limited number of narrow passages limits the throughput between the halls. The pylon station was the earliest type of deep underground station. One variation is the so-called London-style station. In such stations the central hall is reduced to the size of an anteroom, leading to the inclined walkway or elevators. In some cases the anteroom is also the base of the escalators. In the countries of
7004-702: The line; expresses did not run during late nights or Sundays. When the IND Concourse Line opened on July 1, 1933, the C express train started operating, while all locals became CC trains to the Concourse Line. The E began using the local tracks on August 19, 1933, when the IND Queens Boulevard Line opened. The first portion of the Sixth Avenue Line to be constructed was the Houston–Essex Street Line south of
7107-408: The long axis of the station. Stations can be double-span with a single row of columns, triple-span with two rows of columns, or multi-span. The typical shallow column station in Russia is triple-span, assembled from concrete and steel, and is from 102 to 164 metres in length with a column spacing of 4–6 m. Along with the typical stations, there are also specially built stations. For example, one of
7210-399: The lower deck with automobiles above, now converted to one-way road vehicle traffic on each deck. In Turkey, the Eurasia Tunnel under the Bosphorus , opened in 2016, has at its core a 5.4 km (3.4 miles) two-deck road tunnel with two lanes on each deck. Additionally, in 2015 the Turkish government announced that it will build three -level tunnel, also under the Bosporus. The tunnel
7313-549: The major transfer point between its two Manhattan trunk lines. It is the location of the zero point on the IND chaining . It is a bi-level station with a connecting concourse between the two platform levels. The Eighth Avenue Line occupies the upper level, while the Sixth Avenue Line uses the lower level. Both levels use identical platform arrangements–two island platforms between four tracks, allowing for cross-platform interchanges between local and express trains in each direction. The Eighth Avenue Line's express tracks are used by
7416-400: The mezzanine. Two went to Washington Place, and the other two went to West 4th Street itself. There is a fifth closed exit at one northern fare control area; it led to the southwestern corner of Greenwich Avenue and Sixth Avenue. nycsubway.org Google Maps Street View Metro station A metro station or subway station is a train station for a rapid transit system, which as
7519-456: The next express station to the north. As such, the green tiles used at the West Fourth Street station were also used on local stations to the north on Sixth Avenue, 14th Street and 23rd Street . The next express stations on either line, 14th Street on the Eighth Avenue Line and 34th Street–Herald Square on Sixth Avenue, used a different tile color. When the station was under construction, New York University (NYU) officials had requested that
7622-521: The northern end of the station, and one at the southern end. All lead directly to the Eighth Avenue Line on the upper level platforms; access to the Sixth Avenue Line on the lower level is via stairs and elevators from the upper level and/or the full-length mezzanine between the two levels. Several escalators are present, which go directly between one of the lower level platforms to its corresponding upper level platform. The elevators, added in April 2005 to make
7725-483: The older method of tunnelling in compressed air, with an airlock/decompression chamber some way back from the TBM, which required operators to work in high pressure and go through decompression procedures at the end of their shifts, much like deep-sea divers . In February 2010, Aker Wirth delivered a TBM to Switzerland, for the expansion of the Linth–Limmern Power Stations located south of Linthal in
7828-492: The older signs which simply read "W4". The station does not have an exit to Fourth Street itself anymore, though an exit formerly existed there. The northern exits are on the northern side of 6th Avenue and Waverly Place. Two staircases go up to the northeast corner, both built into alcoves of stores, and one to the northwest corner. The southern exits are at West Third Street, on the east and west sides of 6th Avenue. There are also four additional closed exits that directly led to
7931-540: The operation of empty and loaded trains at the same time. The temporary way is replaced by the permanent way at completion, thus explaining the term " Perway ". The vehicles or traffic using a tunnel can outgrow it, requiring replacement or enlargement: An open building pit consists of a horizontal and a vertical boundary that keeps groundwater and soil out of the pit. There are several potential alternatives and combinations for (horizontal and vertical) building pit boundaries. The most important difference with cut-and-cover
8034-587: The other was installed on the southbound side. As part of a $ 4.3 million project, the Metropolitan Transportation Authority (MTA) closed the escalators for renovations in 1998. In 2002, the MTA announced that elevators would be installed at the West Fourth Street station. The elevator installation was delayed by over a year and was finally completed in April 2005, but the elevators then suffered from frequent breakdowns. In 2005 alone,
8137-506: The peak direction, and the M on weekdays during the day. The next stop to the north is 14th Street/Sixth Avenue for Sixth Avenue local trains, 34th Street–Herald Square for Sixth Avenue express trains, and 14th Street/Eighth Avenue for all Eighth Avenue trains. The next stop to the south is Broadway–Lafayette Street for all Sixth Avenue trains, Spring Street for Eighth Avenue local trains, and Canal Street for Eighth Avenue express trains. There are three fare control areas – two at
8240-522: The project is completed. If a tunnel is going to be long, multiple shafts at various locations may be bored so that entrance to the tunnel is closer to the unexcavated area. Once construction is complete, construction access shafts are often used as ventilation shafts , and may also be used as emergency exits. The New Austrian Tunnelling method (NATM)—also referred to as the Sequential Excavation Method (SEM) —was developed in
8343-490: The proper machinery must be selected. Large infrastructure projects require millions or even billions of dollars, involving long-term financing, usually through issuance of bonds . The costs and benefits for an infrastructure such as a tunnel must be identified. Political disputes can occur, as in 2005 when the US House of Representatives approved a $ 100 million federal grant to build a tunnel under New York Harbor. However,
8446-482: The risk of encountering unforeseen ground conditions. In planning the route, the horizontal and vertical alignments can be selected to make use of the best ground and water conditions. It is common practice to locate a tunnel deeper than otherwise would be required, in order to excavate through solid rock or other material that is easier to support during construction. Conventional desk and preliminary site studies may yield insufficient information to assess such factors as
8549-481: The same for the tunnels. The doors add cost and complexity to the system, and trains may have to approach the station more slowly so they can stop in accurate alignment with them. Metro stations, more so than railway and bus stations, often have a characteristic artistic design that can identify each stop. Some have sculptures or frescoes. For example, London's Baker Street station is adorned with tiles depicting Sherlock Holmes . The tunnel for Paris' Concorde station
8652-493: The section between the West Fourth Street and 34th Street–Herald Square stations, originally did not have express tracks. On April 19, 1961, ground was broken for a $ 22 million project to build two express tracks between these two stations. On November 26, 1967, the express tracks started to be used by the B and D trains. At that time, the first part of the Chrystie Street Connection opened, connecting
8755-542: The sheer size of the excavation. This contrasts with many traditional stations on London Underground , where bored tunnels were used for stations and passenger access. Nevertheless, the original parts of the London Underground network, the Metropolitan and District Railways, were constructed using cut-and-cover. These lines pre-dated electric traction and the proximity to the surface was useful to ventilate
8858-792: The spans may be replaced with a monolithic vault (as in the Moskovskaya station of the Samara Metro or Sibirskaya of the Novosibirsk Metro ). In some cases, one of the rows of columns may be replaced with a load-bearing wall. Such a dual hall, one-span station, Kashirskaya , was constructed to provide a convenient cross-platform transfer. Recently, stations have appeared with monolithic concrete and steel instead of assembled pieces, as Ploshchad Tukaya in Kazan . The typical shallow column station has two vestibules at both ends of
8961-466: The station ADA-accessible , provide access to both levels and to the mezzanine . The walls of the station contain green-tile bands with green borders; since West 4th Street is an express station, it has a wider tile band than local stations. The tile colors were designed to facilitate navigation for travelers going away from Lower Manhattan ; on the Sixth and Eighth Avenue lines, the tiles change color at
9064-441: The station contain purple tile bands because that was NYU's official color. However, this was not done because it would not have fit with the color-coded tile system used on the rest of the IND. Small tile captions reading "WEST 4" run below the trim lines at regular intervals. Hunter green I-beam columns run along all the platforms, alternating ones having the standard black station name plate; The signs read "West 4 Street", replacing
9167-470: The station is typically positioned under land reserved for public thoroughfares or parks . Placing the station underground reduces the outside area occupied by the station, allowing vehicles and pedestrians to continue using the ground-level area in a similar way as before the station's construction. This is especially important where the station is serving high-density urban precincts, where ground-level spaces are already heavily utilised. In other cases,
9270-538: The station, most often combined with below-street crossings. For many metro systems outside Russia, the typical column station is a two-span station with metal columns, as in New York City, Berlin, and others. In Chicago, underground stations of the Chicago 'L' are three-span stations if constructed with a centre platform. In the Moscow Metro , approximately half of the stations are of shallow depth, built in
9373-401: The station. This is resolved with elevators, taking a number of people from street level to the unpaid ticketing area, and then from the paid area to the platform. In addition, there will be stringent requirements for emergencies, with backup lighting , emergency exits and alarm systems installed and maintained. Stations are a critical part of the evacuation route for passengers escaping from
9476-480: The three elevators were out of service for a cumulative nine months, and one elevator was closed off for 134 days. That year, passengers made 57 complaints about the elevators, including seven instances in which riders were trapped in the elevators. Consequently, disability-rights groups sued the MTA over the elevators. The West Fourth Street station was built by the Independent Subway System as
9579-529: The train carriages. Access from the street to ticketing and the train platform is provided by stairs , concourses , escalators , elevators and tunnels. The station will be designed to minimise overcrowding and improve flow, sometimes by designating tunnels as one way. Permanent or temporary barriers may be used to manage crowds. Some metro stations have direct connections to important nearby buildings (see underground city ). Most jurisdictions mandate that people with disabilities must have unassisted use of
9682-400: The tunnel drive, the depth of the tunnel, the logistics of supporting the tunnel excavation, the final use and the shape of the tunnel and appropriate risk management. There are three basic types of tunnel construction in common use. Cut-and-cover tunnels are constructed in a shallow trench and then covered over. Bored tunnels are constructed in situ, without removing the ground above. Finally,
9785-428: The two most common being bored tunnels or immersed tubes , examples are Bjørvika Tunnel and Marmaray . Submerged floating tunnels are a novel approach under consideration; however, no such tunnels have been constructed to date. During construction of a tunnel it is often convenient to install a temporary railway, particularly to remove excavated spoil , often narrow gauge so that it can be double track to allow
9888-462: Was completed by September 1931, except for the installation of turnstiles. A preview event for the new subway was hosted on September 8, 1932, two days before the official opening. The upper level of the West Fourth Street station opened on September 10, 1932, as part of the city-operated IND's initial segment, the Eighth Avenue Line between Chambers Street and 207th Street . When the station opened in 1932, express ( A ) and local ( AA ) trains served
9991-575: Was constructed to provide a second harbour crossing and to alleviate traffic congestion on the Sydney Harbour Bridge , without spoiling the iconic view. Other reasons for choosing a tunnel instead of a bridge include avoiding difficulties with tides, weather, and shipping during construction (as in the 51.5-kilometre or 32.0-mile Channel Tunnel ), aesthetic reasons (preserving the above-ground view, landscape, and scenery), and also for weight capacity reasons (it may be more feasible to build
10094-413: Was discontinued. As early as 1965, Manhattan borough president Earl Brown requested that mayor Robert F. Wagner Jr. add funding for an escalator at the West Fourth Street station to the city's capital budget. Two up-only escalators were installed in the station in 1970, connecting the Sixth Avenue Line platforms to the Eighth Avenue Line platforms; one escalator was installed on the northbound side, while
10197-481: Was diverted along the new line south of West Fourth Street. When the Houston–Essex Street Line was completed in April 1936, E trains ran to Church Avenue . The Midtown section of the Sixth Avenue Line was much more difficult to construct because part of this stretch of Sixth Avenue was already occupied by the Hudson & Manhattan Railroad (H&M)'s Uptown Hudson Tubes , which ran between Eighth and 33rd Streets. As
10300-492: Was extended south to Church Street starting in 1926. This required the demolition of dozens of buildings along the route, including a hotel and several houses within the vicinity of the West Fourth Street station. By August 1930, the BOT reported that the Eighth Avenue Line was nearly completed, except for the stations between Chambers Street–Hudson Terminal and West Fourth Street, which were only 21 percent completed. The entire line
10403-528: Was named " West Fourth Street" as opposed to merely "Fourth Street" because the planners of the Independent Subway System believed there would be confusion between this station and "South Fourth Street" , a proposed transfer station on the never-built IND Second System in Williamsburg , Brooklyn . Real estate developers expected that the construction of the West Fourth Street station would spur development around Sixth Avenue in Lower Manhattan. Work on
10506-732: Was superseded by the Madrid M30 ringroad , Spain, and the Chong Ming tunnels in Shanghai , China. All of these machines were built at least partly by Herrenknecht . As of August 2013 , the world's largest TBM was " Big Bertha ", a 17.5-metre (57.5 ft) diameter machine built by Hitachi Zosen Corporation , which dug the Alaskan Way Viaduct replacement tunnel in Seattle, Washington (US). A temporary access shaft
10609-411: Was to connect with the lower level of the West Fourth Street station, which had already been constructed. The line's Midtown section opened on December 15, 1940. The F train, which made local stops along the Sixth Avenue Line, replaced the E train along the Houston–Essex Street Line and started serving the lower level of the West Fourth Street station. The Sixth Avenue Line's Midtown section, comprising
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