British Rail Class 45
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| Type and origin | |
|---|---|
| Power type | Diesel-electric |
| Builder | British Railways' Derby Works and Crewe Works |
| Build date | 1960–1962 |
| Total produced | 127 |
| Specifications | |
|---|---|
| Configuration: |
|
| • Whyte | 1Co-Co1 |
| • UIC | (1Co)'(Co1)' |
| 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; 149 short tons) |
| Fuel capacity | 840 imp gal (3,800 l; 1,010 US gal) |
| Prime mover | Sulzer 12LDA28-B |
| Engine type | double bank |
| Displacement | 12 x 22 litres (1,300 cu in) per cylinder, or 264 litres (16,100 cu in) total |
| Generator | Crompton Parkinson |
| Traction motors | Crompton Parkinson |
| Cylinders | 12 |
| Cylinder size | 280 mm × 360 mm (11.024 in × 14.173 in), bore x stroke |
| MU working | ★ Blue Star |
| Train heating |
45/0: Steam 45/1: Electric Train Heat |
| Loco brake | Air |
| Train brakes | Vacuum and Air |
| Performance figures | |
|---|---|
| Maximum speed | 90 mph (145 km/h) |
| Power output |
Engine: 2,500 bhp (1,864 kW) At rail: 2,000 hp (1,491 kW) |
| Tractive effort | Maximum: 55,000 lbf (245 kN) |
| Brakeforce | 63 long tons-force (628 kN) |
| Career | |
|---|---|
| Operators | British Railways |
| Numbers | D11–D137; later 45001–45077, 45101–45150 |
| Nicknames | 'Peak' |
| Axle load class | Route availability 7 |
The British Rail Class 45 also known as the Sulzer Type 4 diesel locomotives were built by British Rail at their Derby and Crewe Works between 1960 and 1962. Along with the similar Class 44 and 46 locomotives, they became known as "Peaks".
The Class 45s became the main traction on the Midland Main Line from 1962, and their introduction allowed considerable acceleration of the previous steam-powered service. The Class 45s remained the main source of power on the Midland Main Line up to 1982, when they were relegated to secondary services following introduction of HSTs on the route. From 1986 Class 45s virtually disappeared from the line. From the early 1980s until their withdrawal c.1988, the class were regular performers on the North Trans-Pennine line working services from Liverpool Lime Street to York, Scarborough or Newcastle via Manchester Victoria, Huddersfield and Leeds. These trains were usually formed of early British Railways Mark 2 carriages, of up to seven in a typical train.
The engine of the Class 45 was a marine-type, slow-revving diesel, a Sulzer 12LDA28B with a bore of 280 mm (11.024 in) and a stroke of 360 mm (14.173 in). This gave 22 litres (1,300 cu in) per cylinder, or 264 litres (16,100 cu in) for the whole engine. The unit was turbocharged and intercooled and gave 2,500 hp (1,900 kW) at 750 rpm. The engine was of the double bank type with two parallel banks of 6 cylinders, geared together to a single output shaft. Six-cylinder versions of the engine were fitted in the Class 25 locos (amongst others) and eight-cylinder versions in Class 33s. Class 45s were the updated versions of the Class 44 locomotives, the latter having a 2,300 hp (1,700 kW) non-intercooled version of the same engine; i.e. the 12LDA28A. The later Class 47 had a modified version of the same engine, a 12LDA28C.
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