British Rail Class 29

British Railways Class 29
D6121 in BR green livery with white stripe and large yellow warning panel and headcode at Inverness MPD, August 1968
Type and origin Power type Diesel-electric Builder North British Locomotive Co. Build date 1958–1960 (original Class 21) Rebuilder Paxman Rebuild date Rebuilt: 1963, 1965–1967 Number rebuilt 20
Specifications Configuration: ​  • UIC Bo'Bo'  • Commonwealth Bo-Bo Gauge 4 ft 8+1⁄2 in (1,435 mm) standard gauge Wheel diameter 3 ft 7 in (1.092 m) Minimum curve 3.5 chains (231.00 ft; 70.41 m) Wheelbase 37 ft 0 in (11.28 m) Length 51 ft 6 in (15.70 m) Width 8 ft 8 in (2.64 m) Height 12 ft 8 in (3.86 m) Loco weight 73 long tons (74.2 t; 81.8 short tons) Fuel capacity 460 imp gal (2,100 L; 550 US gal) Prime mover Paxman Ventura Engine type V12 diesel Generator DC generator Traction motors 4 GEC DC motors Transmission Diesel electric MU working ● Red Circle Train heating Steam Train brakes Vacuum
Performance figures Maximum speed 80 mph (130 km/h) Power output Engine: 1,350 hp (1,010 kW) Tractive effort Maximum: 45,000 lbf (200 kN) Brakeforce 50 long tons-force (498 kN)
Career Operators British Rail Numbers D6100–03/06–08/12–14/16/19, D6121/23/24/29/30/32/33/37 Axle load class Route availability 6 (RA 5 from 1969) Retired 1969–1971 Disposition All scrapped

The British Rail Class 29 were a class of 20 diesel-electric Bo-Bo locomotives produced by the re-engining of the NBL Type 2 units. The units were designed for both passenger and freight trains.