British Rail Class 44

Derby Type 4
British Rail Class 44
Preserved Class 44 number D8 at Rowsley South, on Peak Rail
Type and origin
Power typeDiesel-electric
BuilderBritish Railways’ Derby Works
Total produced10
Specifications
Configuration:
​
 • Whyte1Co-Co1
 • UIC(1Co)'(Co1)'
Gauge4 ft 8 1⁄2 in (1,435 mm) standard gauge
Wheel diameter3 ft 9 in (1.143 m)
Minimum curve5 chains (100 m)
Wheelbase59 ft 8 in (18.19 m)
Length67 ft 11 in (20.70 m)
Width8 ft 10+1⁄2 in (2.71 m)
Height12 ft 10 in (3.91 m)
Loco weight133 long tons (135 t)
Fuel capacity840 imp gal (3,800 L; 1,010 US gal)
Prime moverSulzer 12LDA28-A
MU working★ Blue Star
Train heatingSteam generator
Train brakesVacuum
Performance figures
Power outputEngine: 2,300 bhp (1,715 kW)
At rail: 1,800 hp (1,342 kW)
Tractive effortMaximum: 50,000 lbf (222 kN)
Brakeforce63 long tons-force (628 kN)
Career
Railroad(s)British Railways
NumberD1–D10; later 44001–44010
Nicknames‘Peak’
Axle load classRoute availability 7

The British Rail Class 44 or Sulzer Type 4 diesel locomotives were built by British Railways' Derby Works between 1959 and 1960. They were named after British mountains, and were then nicknamed Peaks.

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