British Rail Class 46
| Derby Type 4 British Rail Class 46 |
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| Power type | Diesel-electric |
|---|---|
| Builder | British Railways’ Derby Works |
| Build date | 1961–1963 |
| Total production | 56 |
| Configuration | 1Co-Co1 |
| UIC classification | (1Co)'(Co1)' |
| Wheel diameter | 3 ft 9 in (1.143 m) |
| Minimum curve | 3.5 chains (70 m) |
| Wheelbase | 59 ft 8 in (18.19 m) |
| Length | 67 ft 11 in (20.70 m) |
| Width | 8 ft 10½ in (2.71 m) |
| Height | 12 ft 10 in (3.91 m) |
| Locomotive weight | 138 long tons (140 t) |
| Fuel capacity | 790 imp gal (3,600 l; 950 US gal) |
| Prime mover | Sulzer 12LDA28-B |
| Multiple working | ★ Blue Star |
| Top speed | 90 mph (145 km/h) |
| Power output | Engine: 2,500 bhp (1,864 kW) At rail: 1,962 hp (1,463 kW) |
| Tractive effort | Maximum: 55,000 lbf (245 kN) |
| Train heating | Steam |
| Locomotive brakeforce | 63 LTf (628 kN) |
| Train brakes | Vacuum |
| Career | British Railways |
| Number | D138–D193; later 46001–46056 |
| Nicknames | ‘Peak’ |
| Axle load class | Route availability 7 |
The British Rail Class 46 is a class of diesel locomotive. They were built from 1961-1963 at British Railways' Derby Works and were initially numbered D138-D193. With the arrival of TOPS they were renumbered to Class 46. Fifty-six locomotives were built. The first was withdrawn in 1977 and all of them were withdrawn by 1984.
The Class 46 design was structurally the same as the preceding Class 45 build, and had the same Sulzer engine, but differed in the fitment of a Brush generator and traction motors, in place of the Crompton Parkinson equipment fitted to the Class 45.
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