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British Rail Class 455

British Rail Class 455
SWT 455729 Clapham Junction.jpg
A South West Trains Class 455/7 at Clapham Junction.
Guildford railway station MMB 16 455863.jpg
The interior of a South West Trains Class 455 EMU.
In service 1982 - Current
Manufacturer BREL York
Family name BR Second Generation (Mark 3)
BREL 1972 "PEP" (Class 455/7 intermediate)
Number built 137 trainsets
Formation 4 cars per trainset
Capacity
  • 272 seats (South West Trains)
  • 310 seats (Southern)
Operator(s)
Specifications
Train length 81.16 m (266 ft 3 14 in)
Car length 19.83 m (65 ft 34 in)
Width 2.82 m (9 ft 3 in)
Maximum speed 75 mph (121 km/h)
Weight 135.95 tonnes (133.80 long tons; 149.86 short tons)
Electric system(s) 750 V DC third rail
Current collection method Contact shoe
Braking system(s) Air (Westcode)
Track gauge 1,435 mm (4 ft 8 12 in) standard gauge

The British Rail Class 455 is a type of electric multiple-unit passenger train drawing power from a 750 V DC third rail. Built by BREL York works in the early and mid-1980s, they were initially categorised as Class 510 as the successor to the Class 508. They are used on suburban services in South London, by South West Trains and Govia Thameslink Railway (GTR) for Southern services.

There were three batches of Class 455 units, all consisting of 4 cars: driving carriages at each end, an intermediate trailer vehicle and an intermediate motorised vehicle (powered by four EE507-20J of 185 kW carried on the bogies of the MSO vehicle, some recovered from Class 405), all originally built to the Standard Class 3+2 seating arrangement. Technically, they are formed DTSO+MSO+TSO+DTSO. They have the same bodyshell as the Class 317 and Class 318, but as they were designed for inner suburban services they do not feature first class seating, air conditioning or toilet facilities and are restricted to 75 mph (121 km/h). Like the Class 317/318, as well as the diesel Class 150, they are based on British Rail Mark 3 coaches, with a steel construction, unlike the earlier PEP-based Class 313s, 314s, 315s, 507s and 508s, which had an aluminium alloy body.


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