British Rail Class 317

The British Rail Class 317 electric multiple unit passenger trains were constructed by British Rail Engineering Limited in two batches: 48 sets were produced in 1981 and 1982, and a further 24 sets between 1985 and 1987. They were the first of several classes of British Rail electric multiple unit to be based on the all-steel Mark 3 bodyshell, departing from the PEP aluminium design that had produced the earlier Class 313 to Class 315, Class 507 and Class 508. The Mark 3 bodyshell was also the basis of the Class 318, the Class 455 and the diesel Class 150. The Class 317 uses overhead alternating current electrification and enabled LTS Rail to replace its elderly Class 302 slam-door units. All units were withdrawn in July 2022.