Misplaced Pages

Pasadena Subdivision

Article snapshot taken from Wikipedia with creative commons attribution-sharealike license. Give it a read and then ask your questions in the chat. We can research this topic together.

The Pasadena Subdivision is the remnant branch line of the former Atchison, Topeka and Santa Fe Railway (AT&SF) Los Angeles Second District. The line currently branches off of Metrolink’s San Bernardino Line at CP Cambridge in Claremont . The line follows a generally east–west alignment, passing through the cities of Claremont, Pomona , La Verne , San Dimas , Glendora , and Azusa before coming to a truncated end in Irwindale . For most of its length, it shares the corridor with the Los Angeles Metro Rail ’s A Line . Recent construction, known as the Foothill Extension Phase 2B, has seen the tracks out of service west of San Dimas for most of 2021.

#916083

64-696: The line was initially built by the Los Angeles and San Gabriel Valley Railroad (LA&SGV) in 1885. LA&SGV was sold and consolidated on May 20, 1887, into the California Central Railway . In 1889 this was consolidated into Southern California Railway Company. On January 17, 1906, the Southern California Railway was sold to AT&SF. Coupled with the San Bernardino and Los Angeles Railroad, it now

128-508: A slipformed (or pre-cast) concrete base (development 2000s). The 'embedded rail structure', used in the Netherlands since 1976, initially used a conventional UIC 54 rail embedded in concrete, and later developed (late 1990s) to use a 'mushroom' shaped SA42 rail profile; a version for light rail using a rail supported in an asphalt concrete –filled steel trough has also been developed (2002). Modern ladder track can be considered

192-440: A "clickety-clack" sound. Unless it is well-maintained, jointed track does not have the ride quality of welded rail and is less desirable for high speed trains . However, jointed track is still used in many countries on lower speed lines and sidings , and is used extensively in poorer countries due to the lower construction cost and the simpler equipment required for its installation and maintenance. A major problem of jointed track

256-667: A common sleeper. The straight rails could be angled at these joints to form primitive curved track. The first iron rails laid in Britain were at the Darby Ironworks in Coalbrookdale in 1767. When steam locomotives were introduced, starting in 1804, the track then in use proved too weak to carry the additional weight. Richard Trevithick 's pioneering locomotive at Pen-y-darren broke the plateway track and had to be withdrawn. As locomotives became more widespread in

320-415: A continuous reinforced concrete slab and the use of pre-cast pre-stressed concrete units laid on a base layer. Many permutations of design have been put forward. However, ballastless track has a high initial cost, and in the case of existing railroads the upgrade to such requires closure of the route for a long period. Its whole-life cost can be lower because of the reduction in maintenance. Ballastless track

384-481: A development of baulk road. Ladder track utilizes sleepers aligned along the same direction as the rails with rung-like gauge restraining cross members. Both ballasted and ballastless types exist. Modern track typically uses hot-rolled steel with a profile of an asymmetrical rounded I-beam . Unlike some other uses of iron and steel , railway rails are subject to very high stresses and have to be made of very high-quality steel alloy. It took many decades to improve

448-503: A rail station for goods and passengers. Since Lamanda Park had many citrus groves and vineyards, Lamanda Park also had a long side rail line to provided shipping for these goods. Prohibition ended the wineries. The last Lamanda Park citrus packer was Sierra-Madre Lamanda Park Citrus Association, they boxed oranges, lemons, limes, and grapefruit. The packing house was at the corner of Walnut Street and San Gabriel Boulevard. The side rail line also brought lumber to Lamanda Park and later cars to

512-465: A temperature roughly midway between the extremes experienced at that location. (This is known as the "rail neutral temperature".) This installation procedure is intended to prevent tracks from buckling in summer heat or pulling apart in the winter cold. In North America, because broken rails are typically detected by interruption of the current in the signaling system, they are seen as less of a potential hazard than undetected heat kinks. Joints are used in

576-631: A wooden structure rail station depot was built. This structure was replaced by the Santa Fe Depot , which was built in 1926. In February 1887, twenty land owners had a meeting with the Los Angeles and San Gabriel Valley Railroad in Judge Fiery's office. The meeting was about buying land to complete the rail line through Pomona . At the same meeting land was deeded for the rail line through Claremont by C.F. Loop and others. A rail station

640-471: Is 115 to 141 lb/yd (57 to 70 kg/m). In Europe, rail is graded in kilograms per metre and the usual range is 40 to 60 kg/m (81 to 121 lb/yd). The heaviest mass-produced rail was 155 pounds per yard (77 kg/m), rolled for the Pennsylvania Railroad . The rails used in rail transport are produced in sections of fixed length. Rail lengths are made as long as possible, as

704-433: Is a stub . You can help Misplaced Pages by expanding it . Los Angeles and San Gabriel Valley Railroad The Los Angeles and San Gabriel Valley Railroad was a railroad founded on September 5, 1883, by James F. Crank with the goal of bringing a rail line to Pasadena, California from downtown Los Angeles , the line opened in 1886. Los Angeles and San Gabriel Valley Railroad was sold and consolidated on May 20, 1887 into

SECTION 10

#1732776272917

768-408: Is a manual process requiring a reaction crucible and form to contain the molten iron. North American practice is to weld 1 ⁄ 4 -mile-long (400 m) segments of rail at a rail facility and load it on a special train to carry it to the job site. This train is designed to carry many segments of rail which are placed so they can slide off their racks to the rear of the train and be attached to

832-494: Is cracking around the bolt holes, which can lead to breaking of the rail head (the running surface). This was the cause of the Hither Green rail crash which caused British Railways to begin converting much of its track to continuous welded rail. Where track circuits exist for signalling purposes, insulated block joints are required. These compound the weaknesses of ordinary joints. Specially-made glued joints, where all

896-466: Is graded by its linear density , that is, its mass over a standard length. Heavier rail can support greater axle loads and higher train speeds without sustaining damage than lighter rail, but at a greater cost. In North America and the United Kingdom, rail is graded in pounds per yard (usually shown as pound or lb ), so 130-pound rail would weigh 130 lb/yd (64 kg/m). The usual range

960-402: Is scarce and where tonnage or speeds are high. Steel is used in some applications. The track ballast is customarily crushed stone, and the purpose of this is to support the sleepers and allow some adjustment of their position, while allowing free drainage. A disadvantage of traditional track structures is the heavy demand for maintenance, particularly surfacing (tamping) and lining to restore

1024-456: Is starting to paint rails white to lower the peak temperatures reached in summer days. After new segments of rail are laid, or defective rails replaced (welded-in), the rails can be artificially stressed if the temperature of the rail during laying is cooler than what is desired. The stressing process involves either heating the rails, causing them to expand, or stretching the rails with hydraulic equipment. They are then fastened (clipped) to

1088-767: Is to bolt them together using metal fishplates (jointbars in the US), producing jointed track . For more modern usage, particularly where higher speeds are required, the lengths of rail may be welded together to form continuous welded rail (CWR). Jointed track is made using lengths of rail, usually around 20 m (66 ft) long (in the UK) and 39 or 78 ft (12 or 24 m) long (in North America), bolted together using perforated steel plates known as fishplates (UK) or joint bars (North America). Fishplates are usually 600 mm (2 ft) long, used in pairs either side of

1152-435: Is usually considered for new very high speed or very high loading routes, in short extensions that require additional strength (e.g. railway stations), or for localised replacement where there are exceptional maintenance difficulties, for example in tunnels. Most rapid transit lines and rubber-tyred metro systems use ballastless track. Early railways (c. 1840s) experimented with continuous bearing railtrack, in which

1216-754: The Desert Wind from 1979 until 1986, when it was rerouted to the San Bernardino Subdivision to avoid meets on the single-track line. Construction of the Gold Line (now the A Line ) necessitated the abandonment of the western portion of the line. The eastbound Southwest Chief moved to the San Bernardino Subdivision on November 28, 1993, followed by the westbound on January 15, 1994, ending Amtrak service to both Pasadena and North Pomona. Amtrak and freight service

1280-702: The Arroyo Seco to Pasadena. The railroad train crossed the Arroyo Seco just north of Garvanza in Highland Park . The first Pasadena Rail Station was built in 1887 was wooden structure, it was later replaced in 1934. The rail line started a boom in Pasadena, the Hotel Green was started by Edward C. Webster in 1887 and finished in 1888 by George Gill Green . The hotel patrons arrived by train at

1344-714: The California Central Railway . In 1889 this was consolidated into Southern California Railway Company. On Jan. 17, 1906 Southern California Railway was sold to the Atchison, Topeka and Santa Fe Railway and called the Pasadena Subdivision . The main line closed in 1994. The railroad later reopened as the MTA Gold Line Light Rail service in July 2003. James F. Crank founded the Los Angeles and San Gabriel Valley Railroad on Sept. 5, 1883 with

SECTION 20

#1732776272917

1408-682: The Gold Line Foothill Extension project; the site of the original 1886 Monrovia station is under construction. The line will continue to the site of the old Azusa station , which opened in 2016. Santa Fe built a service line just south of the main line (The Second District of the AT&;SF) in Pasadena, this ran along near Walnut Street from Eaton Canyon wash to Wilson Ave. This ROW has been sold off little by little. The raised grade for this line can still be seen on Sierra Madre Boulevard , just north Colorado Boulevard , near

1472-493: The London, Midland and Scottish Railway pioneered the conversion to flat-bottomed rail in Britain, though earlier lines had made some use of it. Jointed rails were used at first because contemporary technology did not offer any alternative. However, the intrinsic weakness in resisting vertical loading results in the ballast becoming depressed and a heavy maintenance workload is imposed to prevent unacceptable geometrical defects at

1536-537: The 1810s and 1820s, engineers built rigid track formations, with iron rails mounted on stone sleepers, and cast-iron chairs holding them in place. This proved to be a mistake, and was soon replaced with flexible track structures that allowed a degree of elastic movement as trains passed over them. Traditionally, tracks are constructed using flat-bottomed steel rails laid on and spiked or screwed into timber or pre-stressed concrete sleepers (known as ties in North America), with crushed stone ballast placed beneath and around

1600-415: The 20th century, rail track used softwood timber sleepers and jointed rails, and a considerable amount of this track remains on secondary and tertiary routes. In North America and Australia, flat-bottomed rails were typically fastened to the sleepers with dog spikes through a flat tie plate. In Britain and Ireland, bullhead rails were carried in cast-iron chairs which were spiked to the sleepers. In 1936,

1664-665: The Desert Wind to the Fullerton Line in 1986. The Santa Fe line served the San Gabriel Valley until 1994, when the 1994 Northridge earthquake weakened the bridge in Arcadia. In the late 1990s construction of the L Line started and opened on July 26, 2003. Thus the old Los Angeles and San Gabriel Valley Railroad right of way (ROW) is still in use today. In 2013 construction on the old ROW started again with

1728-570: The San Gabriel Valley was also a loom to the valley's citrus, nuts and fruit growers, with a new way to get their goods to market. The original 1887 Rancho Santa Anita station, later called the Arcadia Santa Fe Station was moved to the Fairplex 's Rail Giants museum in 1969. On Jan. 17, 1906 Southern California Railway was sold to the Atchison, Topeka and Santa Fe Railway and called the Pasadena Subdivision . Lamanda Park had

1792-528: The VW dealer there. Lamanda Park had many citrus groves and vineyards, the station provided shipping for these goods. Prohibition ended the wineries. The last Citrus packer was Sierra-Madre Lamanda Park Citrus Association, they boxed oranges, lemons, limes, and grapefruit. The packing house was at the corner of Walnut Street and San Gabriel Boulevard. Service to Lamanda Park ended in the 1950s. The service line stopped at lumber yards and car dealers in Pasadena till it

1856-720: The adjacent Pasadena station. The hotel still stands on South Raymond Avenue in Old Pasadena . With the goal of connecting all of the San Gabriel Valley , in November 1886 the Los Angeles and San Gabriel Valley Railroad started building a line West from Mud Springs (what is now San Dimas ). By January 1887 the rail had crossed the San Gabriel River in Azusa . In 1887 the line continued to Monrovia where

1920-400: The bolt heads on the same side of the rail. Small gaps which function as expansion joints are deliberately left between the rail ends to allow for expansion of the rails in hot weather. European practice was to have the rail joints on both rails adjacent to each other, while North American practice is to stagger them. Because of these small gaps, when trains pass over jointed tracks they make

1984-465: The continuous welded rail when necessary, usually for signal circuit gaps. Instead of a joint that passes straight across the rail, the two rail ends are sometimes cut at an angle to give a smoother transition. In extreme cases, such as at the end of long bridges, a breather switch (referred to in North America and Britain as an expansion joint ) gives a smooth path for the wheels while allowing

Pasadena Subdivision - Misplaced Pages Continue

2048-440: The desired track geometry and smoothness of vehicle running. Weakness of the subgrade and drainage deficiencies also lead to heavy maintenance costs. This can be overcome by using ballastless track. In its simplest form this consists of a continuous slab of concrete (like a highway structure) with the rails supported directly on its upper surface (using a resilient pad). There are a number of proprietary systems; variations include

2112-440: The end of one rail to expand relative to the next rail. A sleeper (tie or crosstie) is a rectangular object on which the rails are supported and fixed. The sleeper has two main roles: to transfer the loads from the rails to the track ballast and the ground underneath, and to hold the rails to the correct width apart (to maintain the rail gauge ). They are generally laid transversely to the rails. Various methods exist for fixing

2176-901: The formation of the San Jose Ranch Company. San Jose Ranch Company and M. L. Wicks laid out streets. Small businesses opened in Mud Springs, and soon the city took its new name, San Dimas. The Azusa Land and Water Company sold land in Azusa. A new town near the tracks called Alosta popped, up near Azusa and Southern Glendora , developed by former Sheriff George Gard . The Monrovia Land and Water Company sold land in Monrovia. James F. Crank joined with William Newton Monroe and others in getting Rancho Santa Anita land from Lucky Baldwin in December 1885 to sell. The new rail line through

2240-428: The gaps are filled with epoxy resin , increase the strength again. As an alternative to the insulated joint, audio frequency track circuits can be employed using a tuned loop formed in approximately 20 m (66 ft) of the rail as part of the blocking circuit. Some insulated joints are unavoidable within turnouts. Another alternative is an axle counter , which can reduce the number of track circuits and thus

2304-405: The goal of bringing a rail line to Pasadena from downtown Los Angeles . Los Angeles and San Gabriel Valley Railroad sold stock to get funds to build the new rail line, Lucky Baldwin purchased a large share of stocks, knowing the rail line would open markets for goods from his Rancho Santa Anita . James F. Crank's Los Angeles and San Gabriel Valley Railroad had a slow start. The first rail track

2368-480: The iron came loose, began to curl, and intruded into the floors of the coaches. The iron strap rail coming through the floors of the coaches came to be referred to as "snake heads" by early railroaders. The Deeside Tramway in North Wales used this form of rail. It opened around 1870 and closed in 1947, with long sections still using these rails. It was one of the last uses of iron-topped wooden rails. Rail

2432-402: The joints between rails are a source of weakness. Throughout the history of rail production, lengths have increased as manufacturing processes have improved. The following are lengths of single sections produced by steel mills , without any thermite welding . Shorter rails may be welded with flashbutt welding , but the following rail lengths are unwelded. Welding of rails into longer lengths

2496-440: The joints. The joints also needed to be lubricated, and wear at the fishplate (joint bar) mating surfaces needed to be rectified by shimming. For this reason jointed track is not financially appropriate for heavily operated railroads. Timber sleepers are of many available timbers, and are often treated with creosote , chromated copper arsenate , or other wood preservatives. Pre-stressed concrete sleepers are often used where timber

2560-540: The local dealers. The main line closed in 1994, but reopened in July 2003 as the MTA Gold Line Light Rail service. Jay Gould and Collis Potter Huntington worked hard to keep the Santa Fe Railway out of the San Gabriel Valley. But in May 1887, the first Santa Fe train rolled into Los Angeles . Santa Fe had an expensive agreement to use Southern Pacific to run trains from Colton to Los Angeles. This agreement

2624-888: The mid- to late-20th century used rails 39 feet (11.9 m) long so they could be carried in gondola cars ( open wagons ), often 40 feet (12.2 m) long; as gondola sizes increased, so did rail lengths. According to the Railway Gazette International the planned-but-cancelled 150-kilometre rail line for the Baffinland Iron Mine , on Baffin Island , would have used older carbon steel alloys for its rails, instead of more modern, higher performance alloys, because modern alloy rails can become brittle at very low temperatures. Early North American railroads used iron on top of wooden rails as an economy measure but gave up this method of construction after

Pasadena Subdivision - Misplaced Pages Continue

2688-620: The number of insulated rail joints required. Most modern railways use continuous welded rail (CWR), sometimes referred to as ribbon rails or seamless rails . In this form of track, the rails are welded together by utilising flash butt welding to form one continuous rail that may be several kilometres long. Because there are few joints, this form of track is very strong, gives a smooth ride, and needs less maintenance; trains can travel on it at higher speeds and with less friction. Welded rails are more expensive to lay than jointed tracks, but have much lower maintenance costs. The first welded track

2752-404: The outside of sharp curves compared to the rails on the inside. Rails can be supplied pre-drilled with boltholes for fishplates or without where they will be welded into place. There are usually two or three boltholes at each end. Rails are produced in fixed lengths and need to be joined end-to-end to make a continuous surface on which trains may run. The traditional method of joining the rails

2816-423: The quality of the materials, including the change from iron to steel. The stronger the rails and the rest of the trackwork, the heavier and faster the trains the track can carry. Other profiles of rail include: bullhead rail ; grooved rail ; flat-bottomed rail (Vignoles rail or flanged T-rail); bridge rail (inverted U–shaped used in baulk road ); and Barlow rail (inverted V). North American railroads until

2880-682: The rail by special clips that resist longitudinal movement of the rail. There is no theoretical limit to how long a welded rail can be. However, if longitudinal and lateral restraint are insufficient, the track could become distorted in hot weather and cause a derailment. Distortion due to heat expansion is known in North America as sun kink , and elsewhere as buckling. In extreme hot weather special inspections are required to monitor sections of track known to be problematic. In North American practice, extreme temperature conditions will trigger slow orders to allow for crews to react to buckling or "sun kinks" if encountered. The German railway company Deutsche Bahn

2944-425: The rail ends and bolted together (usually four, but sometimes six bolts per joint). The bolts have alternating orientations so that in the event of a derailment and a wheel flange striking the joint, only some of the bolts will be sheared, reducing the likelihood of the rails misaligning with each other and exacerbating the derailment. This technique is not applied universally; European practice being to have all

3008-500: The rail to the sleeper. Historically, spikes gave way to cast iron chairs fixed to the sleeper. More recently, springs (such as Pandrol clips ) are used to fix the rail to the sleeper chair. Sometimes rail tracks are designed to be portable and moved from one place to another as required. During construction of the Panama Canal , tracks were moved around excavation works. These track gauge were 5 ft ( 1,524 mm ) and

3072-655: The rail was supported along its length, with examples including Brunel's baulk road on the Great Western Railway , as well as use on the Newcastle and North Shields Railway , on the Lancashire and Yorkshire Railway to a design by John Hawkshaw , and elsewhere. Continuous-bearing designs were also promoted by other engineers. The system was tested on the Baltimore and Ohio railway in the 1840s, but

3136-562: The rolling stock full size. Portable tracks have often been used in open pit mines. In 1880 in New York City , sections of heavy portable track (along with much other improvised technology) helped in the move of the ancient obelisk in Central Park to its final location from the dock where it was unloaded from the cargo ship SS Dessoug . Cane railways often had permanent tracks for the main lines, with portable tracks serving

3200-456: The site of the former Azusa station (now served by Azusa Downtown station on the A Line); service started on March 5, 2016. The final planned phase of the light rail line's buildout will complete the reinstatement of passenger service along the corridor, though dedicated freight tracks still remain for BNSF services to industries in Irwindale. This United States rail–related article

3264-426: The sleepers in their expanded form. This process ensures that the rail will not expand much further in subsequent hot weather. In cold weather the rails try to contract, but because they are firmly fastened, cannot do so. In effect, stressed rails are a bit like a piece of stretched elastic firmly fastened down. In extremely cold weather, rails are heated to prevent "pull aparts". CWR is laid (including fastening) at

SECTION 50

#1732776272917

3328-407: The sleepers. Most modern railroads with heavy traffic use continuously welded rails that are attached to the sleepers with base plates that spread the load. When concrete sleepers are used, a plastic or rubber pad is usually placed between the rail and the tie plate. Rail is usually attached to the sleeper with resilient fastenings, although cut spikes are widely used in North America. For much of

3392-511: The ties (sleepers) in a continuous operation. If not restrained, rails would lengthen in hot weather and shrink in cold weather. To provide this restraint, the rail is prevented from moving in relation to the sleeper by use of clips or anchors. Attention needs to be paid to compacting the ballast effectively, including under, between, and at the ends of the sleepers, to prevent the sleepers from moving. Anchors are more common for wooden sleepers, whereas most concrete or steel sleepers are fastened to

3456-561: The underlying subgrade . It enables trains to move by providing a dependable surface for their wheels to roll upon. Early tracks were constructed with wooden or cast iron rails, and wooden or stone sleepers; since the 1870s, rails have almost universally been made from steel. The first railway in Britain was the Wollaton Wagonway , built in 1603 between Wollaton and Strelley in Nottinghamshire. It used wooden rails and

3520-492: Was abandoned in 1980. Rail track A railway track ( British English and UIC terminology ) or railroad track ( American English ), also known as a train track or permanent way (often " perway " in Australia or " P Way " in Britain and India), is the structure on a railway or railroad consisting of the rails , fasteners , railroad ties (sleepers, British English) and ballast (or slab track ), plus

3584-540: Was assigned as the Second District of the AT&SF Los Angeles Division. At one point, this line hosted up to 26 passenger trains each day, including the famed Super Chief and El Capitan . Priority AT&SF freight trains also used the line, usually westbound and local freight along the corridor. With the coming of Amtrak in 1971, the line was used by the daily Super Chief (later renamed Southwest Limited , then Southwest Chief ). The line also hosted

3648-468: Was built in Pomona, there was debate over whether to call it North Pomona Station , Palomares Station, or Palermo Station. Los Angeles and San Gabriel Valley Railroad was sold and consolidated on May 20, 1887 into the California Central Railway . In 1889 this was consolidated into Southern California Railway Company. There was a land boom along the new rail line. In Mud Springs, the land boom resulted in

3712-538: Was certain not return to the city after the 1994 Northridge earthquake had critically damaged a bridge over the 210 Freeway . Gold Line service began on July 26, 2003. In 2013, reconstruction along the former roadbed from Sierra Madre Villa station to APU/Citrus College station began with the Gold Line Foothill Extension and was completed in late 2015. The line currently terminates at APU/Citrus College station, one mile (1.6 km) past

3776-467: Was first introduced around 1893, making train rides quieter and safer. With the introduction of thermite welding after 1899, the process became less labour-intensive, and ubiquitous. Modern production techniques allowed the production of longer unwelded segments. Newer longer rails tend to be made as simple multiples of older shorter rails, so that old rails can be replaced without cutting. Some cutting would be needed as slightly longer rails are needed on

3840-432: Was found to be more expensive to maintain than rail with cross sleepers . This type of track still exists on some bridges on Network Rail where the timber baulks are called waybeams or longitudinal timbers. Generally the speed over such structures is low. Later applications of continuously supported track include Balfour Beatty 's 'embedded slab track', which uses a rounded rectangular rail profile (BB14072) embedded in

3904-533: Was laid in Pasadena in 1884, but the first contractor went bankrupt by the end of 1884. In January 1885, a new contractor started working on the line and the second rail bridge that was needed. A test train ran on Sept. 14 and on September 16, 1885. A grand celebration was held in Pasadena for the completion of the Los Angeles and San Gabriel Valley Railroad from Downtown LA to Lamanda Park in East Pasadena . The rail line went from downtown Los Angeles through

SECTION 60

#1732776272917

3968-475: Was the first of around 50 wooden-railed tramways built over the next 164 years. These early wooden tramways typically used rails of oak or beech, attached to wooden sleepers with iron or wooden nails. Gravel or small stones were packed around the sleepers to hold them in place and provide a walkway for the people or horses that moved wagons along the track. The rails were usually about 3 feet (0.91 m) long and were not joined - instead, adjacent rails were laid on

4032-640: Was used for a year and a half. With the May 20, 1887 sale of the Los Angeles and San Gabriel Valley Railroad to the California Central Railway, (a subsidiary railroad of the Atchison, Topeka and Santa Fe Railway) the two lines where connected together at Mud Springs, completing the rail line from Chicago to Los Angeles through the San Gabriel Valley. Amtrak ran the Southwest Chief and Desert Wind over this line, but relocated

4096-505: Was used in Germany in 1924. and has become common on main lines since the 1950s. The preferred process of flash butt welding involves an automated track-laying machine running a strong electric current through the touching ends of two unjoined rails. The ends become white hot due to electrical resistance and are then pressed together forming a strong weld. Thermite welding is used to repair or splice together existing CWR segments. This

#916083