British Rail Class 103

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British Rail Class 103
In service1957–1983
ManufacturerPark Royal Vehicles
Number built20 sets
Formation2 car sets: DMBS-DTCL
CapacityDMBS: 52S; DTCL 16F 48S
Operator(s)British Rail
Car length57 ft 6 in (17.53 m)
Width9 ft 3 in (2.82 m)
Maximum speed70 mph (113 km/h)
WeightDMBS: 33.40 long tons (33.9 t)
DTCL: 26.35 long tons (26.8 t)
Prime mover(s)Two BUT (AEC) 6-cylinder diesels of 150 brake horsepower (112 kW) each
TransmissionMechanical: 4 speed epicyclic gearbox
Braking system(s)Vacuum
Track gauge4 ft 8 12 in (1,435 mm)

The British Rail Class 103 diesel multiple units were built by Park Royal Vehicles with diesel engines by British United Traction (BUT). Ordered in the first half of 1955, 20 of these sets were built by Park Royal at the Crossley Motors works in Stockport of the ACV Group. They consisted of a power car and a driving trailer. Standard BUT equipment was fitted, with 'A' type engines.

A two-car set with 16 first class and 100 second class seats weighed just under 60 long tons, representing 1,150 lb (520 kg) a seat and had 5 hp per ton of empty weight or 4.35 hp per ton when full.