British Rail Class 317

Ranked #14 on the list Best Locomotive class of All Time

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About British Rail Class 317

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The British Rail Class 317 alternating current electric multiple units (EMUs) were built by BREL York in two batches, from 1981–82 and 1985-87. They were the first of several classes of British Rail EMU to be based on the all-steel Mark 3 bodyshell, departing from the "PEP"-aluminium design which had spawned the earlier Class 313 to Class 315. The Mark 3 bodyshell was also the basis of Class 318, Class 455, and the diesel Class 150. The first batch of 48 units, built in 1981-82, were classified as Class 317/1. Units were numbered in the range 317301-348, and had a maximum speed of 100 mph. Each unit consisted of four carriages; two outer driving 2nd class only vehicles, an intermediate trailer with both 1st and 2nd class, and a motor vehicle with 2nd class seating, roof mounted Stone Faiveley AMBR pantograph and four GEC G315BZ traction motors. The technical description of the formation of the units is DTSO(A)+MSO+TCO+DTSO(B). Individual carriages were numbered as follows: These units were built to operate services on the newly electrified London St. Pancras to Bedford "Bed-Pan" route. They replaced the elderly and unreliable Class 127 diesel multiple units. However, they did not

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