Derby Type 4 British Rail Class 44
Preserved Class 44 number D8 at Rowsley South, on Peak Rail
Type and origin Power type Diesel-electric Builder British Railways’ Derby Works Total produced 10
Specifications Configuration: ​  • Whyte 1Co-Co1  • UIC (1Co)'(Co1)' Gauge 4 ft 8 1⁄2 in (1,435 mm) standard gauge Wheel diameter 3 ft 9 in (1.143 m) Minimum curve 5 chains (100 m) Wheelbase 59 ft 8 in (18.19 m) Length 67 ft 11 in (20.70 m) Width 8 ft 10+1⁄2 in (2.71 m) Height 12 ft 10 in (3.91 m) Loco weight 133 long tons (135 t) Fuel capacity 840 imp gal (3,800 L; 1,010 US gal) Prime mover Sulzer 12LDA28-A MU working ★ Blue Star Train heating Steam generator Train brakes Vacuum
Performance figures Power output Engine: 2,300 bhp (1,715 kW) At rail: 1,800 hp (1,342 kW) Tractive effort Maximum: 50,000 lbf (222 kN) Brakeforce 63 long tons-force (628 kN)
Career Railroad(s) British Railways Number D1–D10; later 44001–44010 Nicknames ‘Peak’ Axle load class Route 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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