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Another design, with a third rail (current feed, outside the running rails) and fourth rail (current return, midway between the running rails), is used by a few steel-wheel systems; see fourth rail. The London Underground is the largest of these (see railway electrification in Great Britain ).
The third rail system resulted, not surprisingly, in a number of accidents. It also resulted in a decree from the Connecticut Supreme Court on June 13, 1906 forbidding the use of third rail electrification within the state. [2] The New Haven was forced by this decision to design their main line electrification system using overhead catenary.
Railway electrification as a means of traction emerged at the end of the nineteenth century, although experiments in electric rail have been traced back to the mid-nineteenth century. [1] Thomas Davenport , in Brandon, Vermont , erected a circular model railroad on which ran battery-powered locomotives (or locomotives running on battery-powered ...
Railway electrification 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.
Converted to 25 kV 50 Hz as a test bed for the future main line electrification system South London line: London Victoria to London Bridge: 1909–1928 Converted to 660 V (later 750 V) DC third-rail supply 8 kV: 25 Hz Germany: Karlsruhe: Alb Valley Railway: 1911–1966, today using 750 V DC 10 kV Netherlands: The Hague – Rotterdam: Hofpleinlijn
These systems can be used to convert three-phase 50 Hz or 60 Hz alternating current (AC) for the supply of AC railway electrification systems at a lower frequency and single phase, as used by many older systems, or to rectify AC into direct current (DC) for those systems (primarily public transit systems) using DC for traction power. The three ...
Modern European systems predominantly make use of bottom or side contact power rails. There are numerous urban rail systems, including these running mostly in tunnels, which do not use third rail at all. Such systems can be found in Asia, which may have been influenced by the overhead power supply formula followed by Tokyo Metro after 1960
The Southern Railway considered the two systems and decided to adopt the LSWR third rail system, and in due course the LBSCR system was converted, and the third rail system was installed over a large proportion of the suburban area of the Southern Railway, as well as some main line installations. The Portsmouth Direct line was electrified in 1937.
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