British Rail Class 66

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British Rail Class 66
66713 'Forest City' at Crewe Works
Power type Diesel-electric
Builder Electro-Motive Diesel
Model JT42CWR or Series 66
Total production Still in production (508+)
Configuration Co-Co
UIC classification Co'Co'
Gauge ft 8+12 in (1,435 mmstandard gauge
Length 20.1 m (65 ft 11 in)
Width 2.65 m (8 ft 8 in)
Height 3.9 m (12 ft 10 in)
Locomotive weight 129.6 tonnes (127.6 long tons; 142.9 short tons)
Fuel capacity 6,400 litres (1,400 imp gal; 1,700 US gal)
Prime mover EMD 12N-710G3B-EC
Class 66/9: EMD 12N-710G3B-T2
Multiple working AAR system (Classes 59, 66 & 67)
Top speed Class 66/6: 65 mph (105 km/h)
Balance of fleet: 75 mph (121 km/h)
Power output Engine: 3,000 bhp (2,200 kW)
Tractive effort Maximum: 409 kN (91,900 lbf) at starting
Continuous: 260 kN (58,500 lbf) at 15.9 mph (25.6 km/h)
Train heating None
Train brakes Westinghouse PBL Air
Career EWS
Direct Rail Services
Freightliner
FirstGBRf
Fastline
Number 66001–66250, 66301–66305, 66401–66435, 66501–66599, 66601–66625, 66701–66732, 66951–66957
Nicknames ‘Shed’
Axle load class Route availability 7

The Class 66 locomotive is a development of the Class 59 and used both on British and European railway networks—where it is marketed as EMD Series 66.