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The additional rail carries the electrical return that, on third-rail and overhead networks, is provided by 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 ...
For this Breitspurbahn railway system, electrification with a voltage of 100 kV taken from a third rail was considered, in order to avoid damage to overhead wires from oversize rail-mounted anti-aircraft guns. However, such a power system would not have worked as it is not possible to insulate a third rail for such high voltages in close ...
A 675 V DC third rail (Top Contact) system was used. [18] Electrification was later changed to 11 kV 25 Hz overhead catenary, when the PRR electrified its mainline to Washington, D. C. in the early 1930s. Third rail is still installed in the East River Tunnels in order to provide power the LIRR trains.
Acton Central station is a changeover point from 750 V DC third rail, to 25 kV AC overhead electrification, on the North London Line. Railway electrification in Great Britain began in the late 19th century. A range of voltages has been used, employing both overhead lines and conductor rails.
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.
Dual electrification is a system whereby a railway line is supplied power both via overhead catenary and a third rail. This is done to enable trains that use either system of power to share the same railway line, for example in the case of mainline and suburban trains (as used at Hamburg S-Bahn between 1940 and 1955).
(four-rail, t/c) LNWR suburban electrification (four-rail, t/c at inception, but now three-rail, t-c between Harrow & Wealdstone and Watford Junction, three-rail, t-c between Acton Central and Gunnersbury, third-rail, t-c between Shoreditch and Highbury & Islington, and overhead electrified between Dalston and Acton Central. Adjacent sections ...
Since 1940. Used both third rail DC (1200 V) and overhead line AC (6.3 kV 25 Hz) until 1955. Also uses German standard 15 kV AC 16 2/3 Hz overhead electrification on the section between Neugraben and Stade on line S3, opened in December 2007.