British United Traction DMUs
| British Rail British United Traction | |
|---|---|
| In service | 1953 - 1962 |
| Number built | 11 |
| Formation | 2-3 car units |
| Operator(s) | British Rail |
| Specifications | |
| Prime mover(s) | 9.6-litre, 125 bhp (93 kW) AEC.--------- 9.8-litre, 125 bhp (93 kW) Leyland 11.3-litre, 150 bhp (110 kW) AEC. ------- 11.1-litre, 150 bhp (110 kW) Leyland. 15-litre, 230 bhp (170 kW) Leyland/Albion |
The British United Traction produced various diesel multiple units.
BUT produced 11 lightweight diesel multiple unit vehicles for British Railways during the 1950s, numbered 79740–79750 with an M at the beginning. the first units finished in 1952. When they finished being reviewed by British Railways, British Railways took them into stock in 1953. They were of three different types of rail cars (DMS, DMBS (containing a compartment for the guard) and TS), and could be made up into two- or three-car units. The first units were fitted with skirts covering their underframes and wheels; they were later removed. They were not very successful so they were all withdrawn by 1962, so never received TOPS classification.
BUT also built the powertrain for the majority of British Rail 'first generation' DMUs.
The engines mainly had six horizontal cylinders and were made in several sizes:
AEC and Leyland engines were those designed and built by the respective companies and were not badge engineered except for BUT badges. Six- and eight-cylinder Rolls Royce diesel engines were also used. The first post-war lightweight DMUs 1954-1969 are reputed to have had pre-war Leyland 8.6-litre horizontal diesel engines fitted. It would be nice to have this confirmed.
Turbo-charged versions of the 11.3-litre (690 cu in) and 15-litre (920 cu in) engines were available, boosting the power outputs to 200 bhp (150 kW) and 275 bhp (205 kW) respectively. The turbo-charged versions were not used by British Railways, but they were used by Ulster Transport Authority.
Some engines were badged AEC, some Leyland and some Leyland-Albion.
Engines were genuine AEC or Leyland, each type carrying B.U.T. badges.
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