British Rail Class 103

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British Rail Class 103
In service 1957–1983
Manufacturer Park Royal Vehicles
Constructed 1957–1958
Number built 20 sets
Formation 2 car sets: DMBS-DTCL
Capacity DMBS: 52S; DTCL 16F 48S
Operator British Rail
Specifications
Car length 57 ft 6 in (17.53 m)
Width 9 ft 3 in (2.82 m)
Maximum speed 70 mph (113 km/h)
Weight DMBS: 33.40 long tons (33.9 t)
DTCL: 26.35 long tons (26.8 t)
Engine(s) Two BUT (AEC) 6-cylinder diesels of 150 brake horsepower (112 kW) each
Transmission Mechanical: 4 speed epicyclic gearbox
Braking system(s) Vacuum
Gauge 4 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.