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.
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