British Rail Janus

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Yorkshire Engine Company ‘Janus’
Typical Janus locomotive at a steelworks.
Power type Diesel-electric
Builder Yorkshire Engine Company
Model Janus
UIC classification C
Wheel diameter 3 ft 8 in (1.118 m)
Locomotive weight 48 long tons (49 t)
Prime mover 2 Rolls Royce C6SFL engines
Traction motors Rolls Royce
Top speed 23 mph (37 km/h)
Power output 400 hp (300 kW)
Tractive effort 30,000 lbf (133.4 kN)

Janus and Taurus were two shunting locomotives by the Yorkshire Engine Company and loaned to British Railways for demonstrations. However, BR did not buy any production versions after testing. At least one other Yorkshire Engine Company locomotive was loaned to British Railways in the 1960s.