British Rail Class 317
| British Rail Class 317 | |
|---|---|
London Overground Class 317/7 No. 317719 at Romford
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The interior of a London Overground Class 317/7
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| In service | 1981 - current |
| Manufacturer | BREL York |
| Family name | BR Second Generation (Mark 3) |
| Constructed | 1981–82, 1985–87 |
| Refurbishment | 2006 - 2007 (FCC) 2013 - 2015 (AGA) 2015 - 2016 (LO) |
| Number built | 72 trainsets |
| Formation | 4 cars per trainset |
| Operator(s) | |
| Specifications | |
| Car length | 19.83 m (65 ft 3⁄4 in) |
| Width | 2.82 m (9 ft 3 in) |
| Height | 3.70 m (12 ft 1 5⁄8 in) |
| Maximum speed | 100 mph (160 km/h) |
| Weight |
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| Power output | 746 kW (1,000 hp) |
| Electric system(s) | 25 kV 50 Hz AC Overhead |
| Current collection method | Pantograph |
| Braking system(s) | Air (Westinghouse) |
| Track gauge | 1,435 mm (4 ft 8 1⁄2 in) standard gauge |
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, Class 507 and Class 508. 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 route. They replaced the elderly and unreliable Class 127 diesel multiple units. However, they did not enter service immediately due to an industrial dispute with the unions over Driver only operation, and the diesel units lingered on until finally being replaced in mid-1983. Units were delivered in the standard livery of BR blue/grey.
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