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British Rail Class 123
A mixed four car DMU stands at Manchester Piccadilly in 1984. The two driving coaches are from a class 123 and the middle coaches are from class 124 units.
In service
1963–1984
Manufacturer
Swindon Works
Family name
First generation
Replaced
Steam locomotives and carriages
Scrapped
1984–1987
Number built
40 (Ten 4-car units)
Number scrapped
All
Formation
DMBSL-TCK-TSL[RB]-DMSK
Capacity
24 First class, 176 Second class seats (units with buffet 32 second class less)
Operators
British Rail
Depots
BG Hull Botanic Gardens[1]
LA Laira
Lines served
Western Region Eastern Region
Specifications
Car body construction
Steel
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)
Bogies
B4
Multiple working
Blue Square
Track gauge
4 ft 8+1⁄2 in (1,435 mm)
The British Rail Class 123 was a design of diesel multiple unit built for British Rail in 1963. They were the last first-generation DMUs built for British Railways and were built at Swindon Works. 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.
^Hemming 1978, pp. 11–12.
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