86-439: The Atlantic Branch is an electrified rail line owned and operated by the Long Island Rail Road in the U.S. state of New York . It is the only LIRR line with revenue passenger service in the borough of Brooklyn . The line consists of two sections constructed separately. The portion of the line from Atlantic Terminal to Jamaica was constructed as part of the Brooklyn and Jamaica Railroad and opened in 1836, while
172-573: A higher total efficiency. Electricity for electric rail systems can also come from renewable energy , nuclear power , or other low-carbon sources, which do not emit pollution or emissions. Electric locomotives may easily be constructed with greater power output than most diesel locomotives. For passenger operation it is possible to provide enough power with diesel engines (see e.g. ' ICE TD ') but, at higher speeds, this proves costly and impractical. Therefore, almost all high speed trains are electric. The high power of electric locomotives also gives them
258-467: A historical concern for double-stack rail transport regarding clearances with overhead lines but it is no longer universally true as of 2022 , with both Indian Railways and China Railway regularly operating electric double-stack cargo trains under overhead lines. Railway electrification has constantly increased in the past decades, and as of 2022, electrified tracks account for nearly one-third of total tracks globally. Railway electrification
344-537: A number of European countries, India, Saudi Arabia, eastern Japan, countries that used to be part of the Soviet Union, on high-speed lines in much of Western Europe (including countries that still run conventional railways under DC but not in countries using 16.7 Hz, see above). Most systems like this operate at 25 kV, although 12.5 kV sections exist in the United States, and 20 kV
430-457: A power grid that is delivered to a locomotive, and within the locomotive, transformed and rectified to a lower DC voltage in preparation for use by traction motors. These motors may either be DC motors which directly use the DC or they may be three-phase AC motors which require further conversion of the DC to variable frequency three-phase AC (using power electronics). Thus both systems are faced with
516-498: A relative lack of flexibility (since electric trains need third rails or overhead wires), and a vulnerability to power interruptions. Electro-diesel locomotives and electro-diesel multiple units mitigate these problems somewhat as they are capable of running on diesel power during an outage or on non-electrified routes. Different regions may use different supply voltages and frequencies, complicating through service and requiring greater complexity of locomotive power. There used to be
602-481: A separate fourth rail for this purpose. In comparison to the principal alternative, the diesel engine , electric railways offer substantially better energy efficiency , lower emissions , and lower operating costs. Electric locomotives are also usually quieter, more powerful, and more responsive and reliable than diesel. They have no local emissions, an important advantage in tunnels and urban areas. Some electric traction systems provide regenerative braking that turns
688-418: A third rail. The key advantage of the four-rail system is that neither running rail carries any current. This scheme was introduced because of the problems of return currents, intended to be carried by the earthed (grounded) running rail, flowing through the iron tunnel linings instead. This can cause electrolytic damage and even arcing if the tunnel segments are not electrically bonded together. The problem
774-411: Is derived by using resistors which ensures that stray earth currents are kept to manageable levels. Power-only rails can be mounted on strongly insulating ceramic chairs to minimise current leak, but this is not possible for running rails, which have to be seated on stronger metal chairs to carry the weight of trains. However, elastomeric rubber pads placed between the rails and chairs can now solve part of
860-451: Is effected by one contact shoe each that slide on top of each one of the running rails . This and all other rubber-tyred metros that have a 1,435 mm ( 4 ft 8 + 1 ⁄ 2 in ) standard gauge track between the roll ways operate in the same manner. Railways and electrical utilities use AC as opposed to DC for the same reason: to use transformers , which require AC, to produce higher voltages. The higher
946-526: Is electrified, companies often find that they need to continue use of diesel trains even if sections are electrified. The increasing demand for container traffic, which is more efficient when utilizing the double-stack car , also has network effect issues with existing electrifications due to insufficient clearance of overhead electrical lines for these trains, but electrification can be built or modified to have sufficient clearance, at additional cost. A problem specifically related to electrified lines are gaps in
SECTION 10
#17327724983741032-486: Is limited and losses are significantly higher. However, the higher voltages used in many AC electrification systems reduce transmission losses over longer distances, allowing for fewer substations or more powerful locomotives to be used. Also, the energy used to blow air to cool transformers, power electronics (including rectifiers), and other conversion hardware must be accounted for. Standard AC electrification systems use much higher voltages than standard DC systems. One of
1118-778: Is no longer exactly one-third of the grid frequency. This solved overheating problems with the rotary converters used to generate some of this power from the grid supply. In the US , the New York, New Haven, and Hartford Railroad , the Pennsylvania Railroad and the Philadelphia and Reading Railway adopted 11 kV 25 Hz single-phase AC. Parts of the original electrified network still operate at 25 Hz, with voltage boosted to 12 kV, while others were converted to 12.5 or 25 kV 60 Hz. In
1204-447: Is sufficient traffic, the reduced track and especially the lower engine maintenance and running costs exceed the costs of this maintenance significantly. Newly electrified lines often show a "sparks effect", whereby electrification in passenger rail systems leads to significant jumps in patronage / revenue. The reasons may include electric trains being seen as more modern and attractive to ride, faster, quieter and smoother service, and
1290-436: Is supplied to moving trains with a (nearly) continuous conductor running along the track that usually takes one of two forms: an overhead line , suspended from poles or towers along the track or from structure or tunnel ceilings, or a third rail mounted at track level and contacted by a sliding " pickup shoe ". Both overhead wire and third-rail systems usually use the running rails as the return conductor, but some systems use
1376-410: Is that the power-wasting resistors used in DC locomotives for speed control were not needed in an AC locomotive: multiple taps on the transformer can supply a range of voltages. Separate low-voltage transformer windings supply lighting and the motors driving auxiliary machinery. More recently, the development of very high power semiconductors has caused the classic DC motor to be largely replaced with
1462-894: Is the countrywide system. 3 kV DC is used in Belgium, Italy, Spain, Poland, Slovakia, Slovenia, South Africa, Chile, the northern portion of the Czech Republic, the former republics of the Soviet Union , and in the Netherlands on a few kilometers between Maastricht and Belgium. It was formerly used by the Milwaukee Road from Harlowton, Montana , to Seattle, across the Continental Divide and including extensive branch and loop lines in Montana, and by
1548-580: Is the development of powering trains and locomotives using electricity instead of diesel or steam power . The history of railway electrification dates back to the late 19th century when the first electric tramways were introduced in cities like Berlin , London , and New York City . In 1881, the first permanent railway electrification in the world was the Gross-Lichterfelde Tramway in Berlin , Germany. Overhead line electrification
1634-762: Is the successor to two separate lines: the Brooklyn and Jamaica Railroad (opened 1836) along Atlantic Avenue from Flatbush Avenue to Jamaica, and the South Side Railroad of Long Island (opened 1867) from Jamaica to Valley Stream. The Brooklyn and Jamaica Railroad opened the line from South Ferry to what is now 151st Street in Jamaica on April 18, 1836. Initially the line turned halfway between Classon and Franklin Avenues, running halfway between Herkimer Street and Schuyler Street (now Atlantic Avenue) along
1720-431: Is underground along Atlantic Avenue . From there the line is elevated above the median of Atlantic Avenue to Dewey Place (with a stop at Nostrand Avenue ) before returning underground. At East New York the line rises to street level to cross above the north-south, freight-only Bay Ridge Branch , then descends underground once more. Between East New York and Jamaica , the closed but intact station at Woodhaven Junction
1806-838: Is used on some narrow-gauge lines in Japan. On "French system" HSLs, the overhead line and a "sleeper" feeder line each carry 25 kV in relation to the rails, but in opposite phase so they are at 50 kV from each other; autotransformers equalize the tension at regular intervals. Various railway electrification systems in the late nineteenth and twentieth centuries utilised three-phase , rather than single-phase electric power delivery due to ease of design of both power supply and locomotives. These systems could either use standard network frequency and three power cables, or reduced frequency, which allowed for return-phase line to be third rail, rather than an additional overhead wire. The majority of modern electrification systems take AC energy from
SECTION 20
#17327724983741892-749: Is visible. At 121st Street in Richmond Hill, Queens , the line rises to street level and passes the Morris Park Facility before joining the elevated Main Line at Jamaica. Immediately east of Jamaica, the line turns southeast, ducking beneath the eastward Main Line tracks. It curves parallel to the Montauk Branch after a few miles and continues next to it to Valley Interlocking in Valley Stream. The current Atlantic Branch
1978-1076: The Broadway and Lexington Avenue els with a connection built at Chestnut Street in Brooklyn. This allowed BRT trains to access the Rockaways and Manhattan Beach, while affording the LIRR a connection into Manhattan to the BRT terminal located at Park Row over the Brooklyn Bridge (this service predated the opening of the East River Tunnels to Penn Station ). Nevertheless, the Interstate Commerce Commission ended this service in 1916 when they classified different operating standards between rapid transit trains (such as BRT trains) and regular heavy rail railroads (such as
2064-656: The Delaware, Lackawanna and Western Railroad (now New Jersey Transit , converted to 25 kV AC) in the United States, and the Kolkata suburban railway (Bardhaman Main Line) in India, before it was converted to 25 kV 50 Hz. DC voltages between 600 V and 750 V are used by most tramways and trolleybus networks, as well as some metro systems as the traction motors accept this voltage without
2150-711: The HSL-Zuid and Betuwelijn , and 3,000 V south of Maastricht . In Portugal, it is used in the Cascais Line and in Denmark on the suburban S-train system (1650 V DC). In the United Kingdom, 1,500 V DC was used in 1954 for the Woodhead trans-Pennine route (now closed); the system used regenerative braking , allowing for transfer of energy between climbing and descending trains on
2236-701: The Innovia ART system. While part of the SkyTrain network, the Canada Line does not use this system and instead uses more traditional motors attached to the wheels and third-rail electrification. A few lines of the Paris Métro in France operate on a four-rail power system. The trains move on rubber tyres which roll on a pair of narrow roll ways made of steel and, in some places, of concrete . Since
2322-636: The Southern Railway serving Coulsdon North and Sutton railway station . The lines were electrified at 6.7 kV 25 Hz. It was announced in 1926 that all lines were to be converted to DC third rail and the last overhead-powered electric service ran in September 1929. AC power is used at 60 Hz in North America (excluding the aforementioned 25 Hz network), western Japan, South Korea and Taiwan; and at 50 Hz in
2408-461: The United States , the New York, New Haven and Hartford Railroad was one of the first major railways to be electrified. Railway electrification continued to expand throughout the 20th century, with technological improvements and the development of high-speed trains and commuters . Today, many countries have extensive electrified railway networks with 375 000 km of standard lines in
2494-726: The Atlantic Branch (then the Old Southern Road ) uses the old South Side to Springfield Junction. The line was soon reopened due to a lawsuit, but closed again by Austin Corbin as of January 6, 1881. Effective May 17, 1906, when an electrified third track opened alongside the Montauk Division from Springfield Junction to Valley Stream, the Old Southern Road and this new track became part of
2580-787: The Atlantic Division. Grade-crossing elimination work between Laurelton and Jamaica began in May 1958. East of Valley Stream, the Far Rockaway Branch continues to Far Rockaway and the Long Beach Branch continues to Long Beach . As of February 27, 2023, the Atlantic Terminal, Nostrand Avenue, and East New York stations are primarily served by a shuttle running between Atlantic Terminal and Jamaica. These stations are also served by trains on
2666-567: The LIRR main line from Berlin Junction (west of Jamaica) to Rockaway Junction and the LIRR's Rockaway Branch to Springfield Junction , where it crossed the South Side. This change took effect June 25, 1876, and resulted in the closure of the South Side's Berlin, Beaver Street (Jamaica), Locust Avenue , and Springfield stations. This formed the current configuration, where the Montauk Branch follows this route, mostly ex-South Side, and
Atlantic Branch - Misplaced Pages Continue
2752-518: The LIRR). By the late 1930s, it was clear that the rest of the line needed to be grade separated. Much of the surrounding area along Atlantic Avenue in Ozone Park and Richmond Hill began their suburban development leading to more traffic along Atlantic Avenue which was plagued by the line's many grade crossings. The City of New York along with the LIRR thus allocated the funds to depress the rest of
2838-717: The Netherlands, New Zealand ( Wellington ), Singapore (on the North East MRT line ), the United States ( Chicago area on the Metra Electric district and the South Shore Line interurban line and Link light rail in Seattle , Washington). In Slovakia, there are two narrow-gauge lines in the High Tatras (one a cog railway ). In the Netherlands it is used on the main system, alongside 25 kV on
2924-544: The Rockaway Beach Branch closed first on June 8, 1962, along with the rest of the Rockaway Beach Branch. The underground station of the Atlantic Branch closed on January 7, 1977 due to vandalism and declining ridership. At the time, only two trains, one in each direction, stopped at Woodhaven. Most lights at the station had been broken by thrown beer bottles and rocks, and the walls were covered with graffiti and were filthy. LIRR President Robert Pattison said
3010-696: The UK, the London, Brighton and South Coast Railway pioneered overhead electrification of its suburban lines in London, London Bridge to Victoria being opened to traffic on 1 December 1909. Victoria to Crystal Palace via Balham and West Norwood opened in May 1911. Peckham Rye to West Norwood opened in June 1912. Further extensions were not made owing to the First World War. Two lines opened in 1925 under
3096-547: The West Hempstead Branch, as well as a limited number of weekday trains on the Hempstead and Babylon branches. Other trains traveling east of Jamaica run to Penn Station , Grand Central Madison , or Long Island City . [REDACTED] Media related to Atlantic Branch (Long Island Rail Road) at Wikimedia Commons Railway electrification Railway electrification is the use of electric power for
3182-494: The ability to pull freight at higher speed over gradients; in mixed traffic conditions this increases capacity when the time between trains can be decreased. The higher power of electric locomotives and an electrification can also be a cheaper alternative to a new and less steep railway if train weights are to be increased on a system. On the other hand, electrification may not be suitable for lines with low frequency of traffic, because lower running cost of trains may be outweighed by
3268-516: The advantages of raising the voltage is that, to transmit certain level of power, lower current is necessary ( P = V × I ). Lowering the current reduces the ohmic losses and allows for less bulky, lighter overhead line equipment and more spacing between traction substations, while maintaining power capacity of the system. On the other hand, the higher voltage requires larger isolation gaps, requiring some elements of infrastructure to be larger. The standard-frequency AC system may introduce imbalance to
3354-410: The distance they could transmit power. However, in the early 20th century, alternating current (AC) power systems were developed, which allowed for more efficient power transmission over longer distances. In the 1920s and 1930s, many countries worldwide began to electrify their railways. In Europe, Switzerland , Sweden , France , and Italy were among the early adopters of railway electrification. In
3440-725: The early expansion plans of the city's Independent Subway System in the 1930s, the Rockaway Beach Branch was planned to be absorbed into the new subway, which would have turned the Woodhaven elevated station into a stop on the IND Queens Boulevard Line or a new Queens crosstown line. In 1950, the Rockaway Beach Branch south of the Howard Beach station had closed after the trestle on Jamaica Bay between The Raunt and Broad Channel Stations
3526-448: The electrification. Electric vehicles, especially locomotives, lose power when traversing gaps in the supply, such as phase change gaps in overhead systems, and gaps over points in third rail systems. These become a nuisance if the locomotive stops with its collector on a dead gap, in which case there is no power to restart. This is less of a problem in trains consisting of two or more multiple units coupled together, since in that case if
Atlantic Branch - Misplaced Pages Continue
3612-522: The elevated station was a two-track wye, curving northwest from the Rockaway branch to merge with the Atlantic branch west of its station at about 96th Street. Woodhaven Junction is one of two stations on the abandoned Rockaway Beach Branch still standing (the other being Ozone Park), while the underground Atlantic Branch station is still visible from passing trains. The now-abandoned LIRR substation
3698-404: The end of funding. Most electrification systems use overhead wires, but third rail is an option up to 1,500 V. Third rail systems almost exclusively use DC distribution. The use of AC is usually not feasible due to the dimensions of a third rail being physically very large compared with the skin depth that AC penetrates to 0.3 millimetres or 0.012 inches in a steel rail. This effect makes
3784-446: The entire line to Jamaica was to be grade separated. Between 1903 and 1905 the line was depressed into a tunnel from Flatbush Avenue to Bedford Avenue, then placed on an elevated viaduct from Bedford Avenue to Ralph Avenue then depressed back into a tunnel until Manhattan Crossing located just west of East New York station. At East New York the line returned to grade level then rose onto another elevated viaduct until Atkins Ave. The rest of
3870-591: The experiment was curtailed. In 1970 the Ural Electromechanical Institute of Railway Engineers carried out calculations for railway electrification at 12 kV DC , showing that the equivalent loss levels for a 25 kV AC system could be achieved with DC voltage between 11 and 16 kV. In the 1980s and 1990s 12 kV DC was being tested on the October Railway near Leningrad (now Petersburg ). The experiments ended in 1995 due to
3956-500: The fact that electrification often goes hand in hand with a general infrastructure and rolling stock overhaul / replacement, which leads to better service quality (in a way that theoretically could also be achieved by doing similar upgrades yet without electrification). Whatever the causes of the sparks effect, it is well established for numerous routes that have electrified over decades. This also applies when bus routes with diesel buses are replaced by trolleybuses. The overhead wires make
4042-1012: The general power grid. This is especially useful in mountainous areas where heavily loaded trains must descend long grades. Central station electricity can often be generated with higher efficiency than a mobile engine/generator. While the efficiency of power plant generation and diesel locomotive generation are roughly the same in the nominal regime, diesel motors decrease in efficiency in non-nominal regimes at low power while if an electric power plant needs to generate less power it will shut down its least efficient generators, thereby increasing efficiency. The electric train can save energy (as compared to diesel) by regenerative braking and by not needing to consume energy by idling as diesel locomotives do when stopped or coasting. However, electric rolling stock may run cooling blowers when stopped or coasting, thus consuming energy. Large fossil fuel power stations operate at high efficiency, and can be used for district heating or to produce district cooling , leading to
4128-411: The high cost of the electrification infrastructure. Therefore, most long-distance lines in developing or sparsely populated countries are not electrified due to relatively low frequency of trains. Network effects are a large factor with electrification. When converting lines to electric, the connections with other lines must be considered. Some electrifications have subsequently been removed because of
4214-490: The line from Atkins Ave to Morris Park located just west of Jamaica remained at grade level along Atlantic Avenue with numerous grade crossings with the anticipation of grade separating the line later on. Additionally a new terminal and yard was built at Flatbush and Atlantic Avenues. Electric service commenced in 1905 with the line consisting of two tracks between Flatbush Avenue and Woodhaven Junction and four tracks beyond that point to Jamaica. LIRR then ran two services along
4300-539: The line from Jamaica to East New York had many more stations along Atlantic Avenue spaced at closer intervals, much like a rapid transit line. The four tracks between Jamaica and Woodhaven Junction lent itself to this service with the "rapid transit" trains using the outer two tracks while commuter trains used the inner two tracks. In November 1925, 25 "local" trains left Brooklyn each weekday for Queens Village, 12 more ran to Hillside, and 16 more ran to Jamaica. All trains made all stops, 15 of them west of Queens Village. Fare
4386-419: The line from Morris Park to East New York in a tunnel. Building of the tunnel commenced in 1939 (although plans to build the tunnel date back to 1893) with two of the line's four tracks being pulled out of service and the rapid transit service being discontinued. On December 28, 1942, the tunnel was completed and opened with the two remaining at-grade tracks pulled out of service. Around this time Atlantic Avenue
SECTION 50
#17327724983744472-458: The line of the present Herkimer Place. It turned slightly to the southeast near Howard Avenue, crossing the centerline of Schuyler Street about one-third of the way between Hopkinson Avenue (Thomas Boyland Street) and Paca Avenue (Rockaway Avenue). It crossed into the town of New Lots just beyond Stone Avenue (Mother Gaston Boulevard). The Atlantic Branch was one of the first lines in the LIRR system slated to be electrified. In anticipation of this
4558-410: The line: the traditional commuter type services from points on eastern Long Island to Flatbush Avenue, along with what was called the "local rapid transit " service, frequent elevated/subway like service at lower fare between Flatbush Ave and Queens Village . Although referred to as a rapid transit service, standard LIRR cars were used, and the service was operated by regular railroad rules. At this time
4644-497: The losses (saving 2 GWh per year per 100 route-km; equalling about €150,000 p.a.). The line chosen is one of the lines, totalling 6000 km, that are in need of renewal. In the 1960s the Soviets experimented with boosting the overhead voltage from 3 to 6 kV. DC rolling stock was equipped with ignitron -based converters to lower the supply voltage to 3 kV. The converters turned out to be unreliable and
4730-422: The maximum power that can be transmitted, also can be responsible for electrochemical corrosion due to stray DC currents. Electric trains need not carry the weight of prime movers , transmission and fuel. This is partly offset by the weight of electrical equipment. Regenerative braking returns power to the electrification system so that it may be used elsewhere, by other trains on the same system or returned to
4816-402: The need for overhead wires between those stations. Maintenance costs of the lines may be increased by electrification, but many systems claim lower costs due to reduced wear-and-tear on the track from lighter rolling stock. There are some additional maintenance costs associated with the electrical equipment around the track, such as power sub-stations and the catenary wire itself, but, if there
4902-505: The phase separation between the electrified sections powered from different phases, whereas high voltage would make the transmission more efficient. UIC conducted a case study for the conversion of the Bordeaux-Hendaye railway line (France), currently electrified at 1.5 kV DC, to 9 kV DC and found that the conversion would allow to use less bulky overhead wires (saving €20 million per 100 route-km) and lower
4988-678: The portion from Jamaica to Valley Stream was constructed as part of the South Side Railroad of Long Island in 1867. Partly underground and partly elevated, the Atlantic Branch runs from Atlantic Terminal in Downtown Brooklyn to Valley Stream , in Nassau County , where it becomes the two-track Long Beach Branch with the two-track Far Rockaway Branch splitting southward just east of the Valley Stream station . The section between Atlantic Terminal and Bedford Avenue
5074-508: The problem by insulating the running rails from the current return should there be a leakage through the running rails. The Expo and Millennium Line of the Vancouver SkyTrain use side-contact fourth-rail systems for their 650 V DC supply. Both are located to the side of the train, as the space between the running rails is occupied by an aluminum plate, as part of stator of the linear induction propulsion system used on
5160-614: The propulsion of rail transport . Electric railways use either electric locomotives (hauling passengers or freight in separate cars), electric multiple units ( passenger cars with their own motors) or both. Electricity is typically generated in large and relatively efficient generating stations , transmitted to the railway network and distributed to the trains. Some electric railways have their own dedicated generating stations and transmission lines , but most purchase power from an electric utility . The railway usually provides its own distribution lines, switches, and transformers . Power
5246-465: The resistance per unit length unacceptably high compared with the use of DC. Third rail is more compact than overhead wires and can be used in smaller-diameter tunnels, an important factor for subway systems. The London Underground in England is one of few networks that uses a four-rail system. The additional rail carries the electrical return that, on third-rail and overhead networks, is provided by
SECTION 60
#17327724983745332-570: The revenue obtained for freight and passenger traffic. Different systems are used for urban and intercity areas; some electric locomotives can switch to different supply voltages to allow flexibility in operation. Six of the most commonly used voltages have been selected for European and international standardisation. Some of these are independent of the contact system used, so that, for example, 750 V DC may be used with either third rail or overhead lines. There are many other voltage systems used for railway electrification systems around
5418-498: The running rails. On the London Underground, a top-contact third rail is beside the track, energized at +420 V DC , and a top-contact fourth rail is located centrally between the running rails at −210 V DC , which combine to provide a traction voltage of 630 V DC . The same system was used for Milan 's earliest underground line, Milan Metro 's line 1 , whose more recent lines use an overhead catenary or
5504-467: The same task: converting and transporting high-voltage AC from the power grid to low-voltage DC in the locomotive. The difference between AC and DC electrification systems lies in where the AC is converted to DC: at the substation or on the train. Energy efficiency and infrastructure costs determine which of these is used on a network, although this is often fixed due to pre-existing electrification systems. Both
5590-525: The service "visible" even in no bus is running and the existence of the infrastructure gives some long-term expectations of the line being in operation. Due to the height restriction imposed by the overhead wires, double-stacked container trains have been traditionally difficult and rare to operate under electrified lines. However, this limitation is being overcome by railways in India, China and African countries by laying new tracks with increased catenary height. Woodhaven Junction Woodhaven Junction
5676-440: The station was a popular hangout spot for neighborhood vandals. The elevated station, located on a trestle adjacent to 100th Street, was built with two concrete high-level side platforms, with staircases down to the street and the Atlantic Branch on either side of Atlantic Avenue. The underground station's design resembled an Independent Subway station, with tile work of the same design; the name mosaic reads "Woodhaven." South of
5762-569: The steep approaches to the tunnel. The system was also used for suburban electrification in East London and Manchester , now converted to 25 kV AC. It is now only used for the Tyne and Wear Metro . In India, 1,500 V DC was the first electrification system launched in 1925 in Mumbai area. Between 2012 and 2016, the electrification was converted to 25 kV 50 Hz, which
5848-443: The supply grid, requiring careful planning and design (as at each substation power is drawn from two out of three phases). The low-frequency AC system may be powered by separate generation and distribution network or a network of converter substations, adding the expense, also low-frequency transformers, used both at the substations and on the rolling stock, are particularly bulky and heavy. The DC system, apart from being limited as to
5934-694: The three-phase induction motor fed by a variable frequency drive , a special inverter that varies both frequency and voltage to control motor speed. These drives can run equally well on DC or AC of any frequency, and many modern electric locomotives are designed to handle different supply voltages and frequencies to simplify cross-border operation. Five European countries – Germany, Austria, Switzerland, Norway and Sweden – have standardized on 15 kV 16 + 2 ⁄ 3 Hz (the 50 Hz mains frequency divided by three) single-phase AC. On 16 October 1995, Germany, Austria and Switzerland changed from 16 + 2 ⁄ 3 Hz to 16.7 Hz which
6020-575: The through traffic to non-electrified lines. If through traffic is to have any benefit, time-consuming engine switches must occur to make such connections or expensive dual mode engines must be used. This is mostly an issue for long-distance trips, but many lines come to be dominated by through traffic from long-haul freight trains (usually running coal, ore, or containers to or from ports). In theory, these trains could enjoy dramatic savings through electrification, but it can be too costly to extend electrification to isolated areas, and unless an entire network
6106-466: The train stops with one collector in a dead gap, another multiple unit can push or pull the disconnected unit until it can again draw power. The same applies to the kind of push-pull trains which have a locomotive at each end. Power gaps can be overcome in single-collector trains by on-board batteries or motor-flywheel-generator systems. In 2014, progress is being made in the use of large capacitors to power electric vehicles between stations, and so avoid
6192-713: The train's kinetic energy back into electricity and returns it to the supply system to be used by other trains or the general utility grid. While diesel locomotives burn petroleum products, electricity can be generated from diverse sources, including renewable energy . Historically, concerns of resource independence have played a role in the decision to electrify railway lines. The landlocked Swiss confederation which almost completely lacks oil or coal deposits but has plentiful hydropower electrified its network in part in reaction to supply issues during both World Wars. Disadvantages of electric traction include: high capital costs that may be uneconomic on lightly trafficked routes,
6278-413: The transmission and conversion of electric energy involve losses: ohmic losses in wires and power electronics, magnetic field losses in transformers and smoothing reactors (inductors). Power conversion for a DC system takes place mainly in a railway substation where large, heavy, and more efficient hardware can be used as compared to an AC system where conversion takes place aboard the locomotive where space
6364-470: The tyres do not conduct the return current, the two guide bars provided outside the running ' roll ways ' become, in a sense, a third and fourth rail which each provide 750 V DC , so at least electrically it is a four-rail system. Each wheel set of a powered bogie carries one traction motor . A side sliding (side running) contact shoe picks up the current from the vertical face of each guide bar. The return of each traction motor, as well as each wagon ,
6450-432: The voltage, the lower the current for the same power (because power is current multiplied by voltage), and power loss is proportional to the current squared. The lower current reduces line loss, thus allowing higher power to be delivered. As alternating current is used with high voltages. Inside the locomotive, a transformer steps the voltage down for use by the traction motors and auxiliary loads. An early advantage of AC
6536-405: The weight of an on-board transformer. Increasing availability of high-voltage semiconductors may allow the use of higher and more efficient DC voltages that heretofore have only been practical with AC. The use of medium-voltage DC electrification (MVDC) would solve some of the issues associated with standard-frequency AC electrification systems, especially possible supply grid load imbalance and
6622-532: The world, and the list of railway electrification systems covers both standard voltage and non-standard voltage systems. The permissible range of voltages allowed for the standardised voltages is as stated in standards BS EN 50163 and IEC 60850. These take into account the number of trains drawing current and their distance from the substation. 1,500 V DC is used in Japan, Indonesia, Hong Kong (parts), Ireland, Australia (parts), France (also using 25 kV 50 Hz AC ) ,
6708-534: The world, including China , India , Japan , France , Germany , and the United Kingdom . Electrification is seen as a more sustainable and environmentally friendly alternative to diesel or steam power and is an important part of many countries' transportation infrastructure. Electrification systems are classified by three main parameters: Selection of an electrification system is based on economics of energy supply, maintenance, and capital cost compared to
6794-599: Was a station complex on the Atlantic Branch and Rockaway Beach Branch of the Long Island Rail Road , located at Atlantic Avenue between 98th and 100th Streets in Woodhaven , Queens , New York City . The elevated Rockaway Beach station was closed in 1962 along with the rest of the branch, while the underground Atlantic Branch station was closed and abandoned on January 7, 1977. The station
6880-532: Was built just west of the Woodhaven Junction station to connect the two lines, but these closed after the abandonment of the Rockaway Beach Branch between 1955 and 1962. The portion east of Jamaica was opened by the South Side Railroad of Long Island on October 28, 1867, as part of its initial line from Jamaica to Babylon . With the consolidation of the South Side into the Long Island Rail Road system in 1876, all passenger trains were rerouted to use
6966-509: Was destroyed by a fire. The city purchased the entire line in 1955, but only the portion south of Liberty Avenue was reactivated for subway service. Ridership declined on the remaining portion of the LIRR Rockaway Beach Branch, and fewer trains were scheduled to stop at Woodhaven on the Atlantic Branch. Passengers who would normally use the station had to ride buses to the next nearest stations. The elevated station of
7052-437: Was exacerbated because the return current also had a tendency to flow through nearby iron pipes forming the water and gas mains. Some of these, particularly Victorian mains that predated London's underground railways, were not constructed to carry currents and had no adequate electrical bonding between pipe segments. The four-rail system solves the problem. Although the supply has an artificially created earth point, this connection
7138-553: Was first applied successfully by Frank Sprague in Richmond, Virginia in 1887-1888, and led to the electrification of hundreds of additional street railway systems by the early 1890s. The first electrification of a mainline railway was the Baltimore and Ohio Railroad's Baltimore Belt Line in the United States in 1895–96. The early electrification of railways used direct current (DC) power systems, which were limited in terms of
7224-505: Was first opened by the LIRR in the 1880s for the Rockaway Beach Branch (then known as the New York, Woodhaven and Rockaway Railroad), and in 1893 for the Atlantic Branch. Beginning in May 1940, both stations were rebuilt when the Atlantic Branch was grade separated and placed in a tunnel. The elevated Rockaway Beach station opened in September 1941, while the underground Atlantic Branch station opened for service on December 28, 1942. In
7310-542: Was probably 10 cents for 13 miles Queens Village to Brooklyn, compared to about 40 cents on "express" LIRR trains making six or seven stops (but a monthly ticket good on any train was $ 7.10). For a while the LIRR operated joint service along the Atlantic Branch with the Brooklyn Rapid Transit company (BRT) consisting of two connections, one with the Fifth Ave El at Flatbush Avenue, and another with
7396-466: Was raised over the East New York station via a viaduct that separated the road and the railroad. The elevated trestle from East New York to Atkins Avenue was also demolished as it had been included in the new tunnel to Jamaica. Only one station was included in the new tunnel: Woodhaven Junction, where the Atlantic Branch crossed under the Rockaway Beach Branch . An interlocking and track connection
#373626