| British Rail Metro-Cammell |
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| In service | 1955–1981 |
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| Manufacturer | Metropolitan Cammell |
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| Number built | 36 sets (72 cars) |
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| Formation | 2 car sets: DMBS-DTSL or DMBS-DTCL |
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| Capacity | DMBS: 57 or 53 second class seats
DTSL: 72 second class
DTCL: 12 first and 53 second class |
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| Operator(s) | British Rail |
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| Car length | 57 feet (17 m) |
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| Width | 9 feet (2.7 m) |
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| Weight | DMBS: 31 long tons 10 cwt (70,500 pounds (32,000 kg))
DTSL: 25 long tons 0 cwt (56,000 pounds (25,000 kg)) |
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| Prime mover(s) | Two BUT (AEC) 6-cylinder diesels of 150 horsepower (110 kW) each |
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| Transmission | Mechanical: 4-speed epicyclic gearbox |
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| Braking system(s) | Vacuum |
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| Track gauge | 4 ft 8 1⁄2 in (1,435 mm) |
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In 1955, Metropolitan Cammell produced its first lightweight Diesel multiple units, the prototypes of what were to become British Rail's most successful and longest-lived First Generation Dmu the Class 101.
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| First generation units: | | dmu |
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First generation units
(pre-TOPS): | |
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| Second generation units: | |
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| Diesel-electric units: | |
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| Southern Railway designations: | |
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| Families | |
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