British Rail Class 457

Ranked #26 on the list Best Locomotive class of All Time

Based on 4 votes

About British Rail Class 457

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Class 316 and Class 457 were TOPS classifications assigned to a single electric multiple unit (EMU) at different stages of its use as a prototype for the Networker series. In the late 1980s, the Network SouthEast division of British Rail, which operated the railway network in South East England, started to develop a new standard train, known as the Networker. To test out the technical arrangements for the Networker, a test train was used, converted from former Class 210 carriages, which were the prototype 'Second Generation' Diesel Electric Multiple Unit (DEMU), but which never entered fleet service. Initially the test unit was formed for trials on the 750 V direct current (DC) third rail system of the Southern Region, and was numbered 457001. As with all Southern Region electric multiple units only the last four digits of the unit number were actually carried. The unit formation was: Later, the unit was altered to undertake trials on the 25kV alternating current (AC) overhead wire system used on electrified lines north of the River Thames. The unit was renumbered as a Class 316 unit, number 316999. To enable it to work on the AC electrification, a pantograph trailer from a Class

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