British Rail Class 123
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|British Rail Class 123|
A mixed four car diesel-mechanical multiple unit formed from a class 123 driving motor corridor second, 2 class 124 trailer brake corridor seconds, and a class 123 driving motor corridor second number at Manchester Piccadilly on 10 March 1984.
|Number built||40 (Ten 4-car units)|
|Capacity||24 First class, 176 Second class seats (units with buffet 32 second class less)|
|Car length||64 ft 11 1⁄4 in (19.793 m)|
|Width||9 ft 3 in (2.82 m)|
|Height||12 ft 9 1⁄2 in (3.899 m)|
|Maximum speed||70 mph (113 km/h)|
|Weight||146.75 long tons (149.10 t; 164.36 short tons)|
|Prime mover(s)||230 hp (172 kW), 2 per power car|
|Power output||920 hp (686 kW)|
|Multiple working||Blue Square|
|Track gauge||4 ft 8 1⁄2 in (1,435 mm)|
The Class 123 was a design of Diesel Multiple Unit built for British Rail in 1963. They were built by British Rail at Swindon Works, and designed like all Swindon units as inter-city sets. Ten of the four-car sets were built and introduced in 1963. The units bear a visible similarity to the British Rail Class 309; however, there is no 'relation' here as the two types were built by different manufacturers for different markets.
Swindon-built DMUs, including the Class 123 and 124, had a structure and internal construction with much more in common with BR coaching stock (British Rail Mark 1) than they do with many DMU classes. The carriage underframes were longer (Mk1 standard main-line 63 ft 6 in (19.35 m) frames, vs the 57 ft 0 in (17.37 m) frames common to most 1st generation DMUs) and the units were provided with Mk1-style "Pullman" gangways instead of the "British Standard Gangways" fitted to most contemporary DMUs of the period. It was also unusual for a first-generation DMU to sport a front end gangway. None of these units survive today.
|Lot No.||Type||Diagram||Qty||Fleet numbers||Notes|
|30703||Driving Motor Brake Open Second (DMBSL)||566||10||52086–52095||32 seats, 2 lavatories|
|30704||Driving Motor Corridor Second (DMSK)||574||10||52096–52105||7 compartments (56 seats), 2 lavatories|
|30705||Trailer Corridor Composite (TCK)||567||10||59818–59827||4 first class and 3 second class compartments: 24 & 24 seats; 2 lavatories|
|30706||Trailer Open Second with lavatory (TSL)||568||5||59235–59239||64 seats, 2 lavatories|
|30707||Trailer Buffet Second (TSLRB)||569||5||59828–59832||32 seats, 8 seats in buffet area, 1 staff lavatory|
One of the buffet cars, 59831 was rebuilt as a Class 309 AC EMU griddle car, and renumbered 69108. It replaced a griddle car that had developed an underframe fault
- Motive Power Recognition: 3 DMUs. Colin J. Marsden
- British Rail Fleet Survey 8: Diesel Multiple Units- The First Generation. Brian Haresnape
- Brown, Murray (July 1984). "Trans Pennine farewell". Rail Enthusiast. EMAP National Publications. pp. 10–12. ISSN 0262-561X. OCLC 49957965.
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