Class 112: 25 sets (50 cars) Class 113: 25 sets (50 cars)
Number scrapped
All
Formation
Power-twin: DMBS-DMCL
Capacity
DMBS: 52 second DMCL: 12 first, 51 second
Operators
British Rail
Lines served
London Midland Region
Specifications
Car body construction
Steel
Car length
57 ft 6 in (17.53 m)
Width
9 ft 3 in (2.82 m)
Doors
Slam
Maximum speed
70 mph (110 km/h)
Weight
DMBS: 30 long tons 0 cwt (67,200 lb or 30.5 t), DMCL: 30 long tons 0 cwt (67,200 lb or 30.5 t)
Prime mover(s)
One Rolls-Royce C8NFLH
Power output
238 hp (177 kW) per car
Transmission
Class 112: Mechanical 4-speed epicyclic gearbox Class 113: Hydraulic
UIC classification
(1A)(A1)+(1A)(A1)
Braking system(s)
Vacuum
Coupling system
Screw-link
Multiple working
■ Blue Square
Track gauge
4 ft 8+1⁄2 in (1,435 mm)
The Class 112 and Class 113 DMUs used the standard Cravens body used on Class 105s but had a single Rolls-Royce C8NFLH engine rated at 238 hp (177 kW) per car, all of which formed into 'power twins' – two car sets with both vehicles powered.
There were two batches built, the first 50 vehicles (25 sets) had standard mechanical transmission via a gearbox and were allocated the Class 112. The second batch of 50 cars (25 sets) had hydraulic transmissions, and became Class 113s.
The cars were built for services in the LMR Central Division and in the Liverpool - St Helens area, where the gradients in the Lancashire & Yorkshire area required more power. Both types also spent some time working from Cricklewood.
The gross weight of a set with all seats occupied was approximately 70 tons, giving 6.8 hp (5.1 kW) per ton. Empty, it was 8.1 hp/ton, which compared favourably with 5.7 hp/ton that the Cravens power/trailer had.
In 1982,[1] two units, M51692 and M51691, were in use by British Steel at Shotton Works on Deeside.
^Industrial Locomotives 1982 including preserved and minor railway locomotives. Industrial Railway Society. 1982. p. 209. ISBN 0-901096-43-1.
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