British Rail Class 01

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British Rail Class 01
Power type Diesel-mechanical
Builder Andrew Barclay Sons & Co.
Serial number 395–398, 424
Build date 1956 (4), 1958 (1)
Total production 5
Configuration 0-4-0
UIC classification B
Gauge ft 8+12 in (1,435 mm)
Wheel diameter 3 ft 2 in (0.965 m)
Minimum curve 1.06 chains (21 m)
Wheelbase 6 ft 0 in (1.83 m)
Length 23 ft 8 in (7.21 m)
Width 8 ft 5 12 in (2.578 m)
Height 11 ft 10 12 in (3.620 m)
Locomotive weight 25 long tons (25 t)
Fuel capacity 325 imp gal (1,480 l; 390 US gal)
Prime mover Gardner 6L3
Engine RPM range 1,200 (max)
Engine type Four-stroke diesel
Transmission Mechanical: Wilson SE4, 4-speed epicyclic gear box, Vulcan-Sinclair type 23 rigid hydraulic coupling, to a Wiseman 15LGB reverse and final drive unit.
Top speed 14.5 mph (23.3 km/h)
Power output Engine: 153 hp (114 kW)
At rail: 102 hp (76 kW)
Tractive effort 12,750 lbf (56.7 kN) (max)
Locomotive brakes Straight Air
Locomotive brakeforce 15 long tons-force (150 kN)
Train brakes 11503–11506: none
18: Vaucuum
Career British Railways
Number 11503–11506, 81 (departmental); later D2953–D2956; later 01001–01002
Axle load class RA 1
Retired 1966–1981

British Rail's Class 01 diesel locomotives were a short wheelbase 0-4-0 diesel-mechanical design intended for use in areas with tight curves and limited clearance.