British Rail Class 125

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British Rail Class 125
E51156, M59454, E50990 & E51159, E59453, E51005 (8416847169).jpg
Class 125 unit leaving Broad Street in April 1969
In service 1958–1977
Manufacturer BR Derby
Number built 20 three-car sets
Number preserved Nil
Formation DMBS-TS-DMS
Capacity 266 second-class, no first
Operator(s) British Rail
Car length 64 ft 0 in (19.51 m) over body
Width 9 ft 4 12 in (2.858 m)
Height 12 ft 9 12 in (3.899 m)
Maximum speed 70 mph (113 km/h)
  • Power cars: 39.0 long tons (39.6 t; 43.7 short tons)
  • Trailers: 32.0 long tons (32.5 t; 35.8 short tons)
Prime mover(s) Two 238-brake-horsepower (177 kW) Rolls-Royce C8NFLH
Power output 952 bhp (710 kW) for 3-car set
Transmission Hydraulic, Twin-disc (Rolls-Royce) torque converter
Multiple working Orange Star
Track gauge 4 ft 8 12 in (1,435 mm)

This article is about the class of first-generation DMU. For the InterCity 125, see British Rail class 43.

The Class 125 was a design of three car Diesel Multiple Unit built by British Rail in 1958. They were high-density units, externally very similar to the Class 116. They were built specifically for the Lea Valley Line based at Stratford, but were displaced to the ECML suburban lines out of Kings Cross when the Lea Valley Line received over head electrification. The class were all withdrawn in 1977 when the ECML suburban lines received 25kV overhead electrification, and none survive to this day. Like many first-generation DMU classes, they never carried their 125xxx TOPS set numbers.


Table of orders and Numbers
Lot No. Type Diagram Fleet Number TOPS Class Seats Notes
30462 Driving Motor Second (DMS) 596 50988–51007 125/1 91
30463 Trailer Second (TS) 597 59449–59468 185 110
30464 Driving Motor Brake Second (DMBS) 595 51154–51173 125/1 65


They were delivered in an unlined medium shade of Brunswick green with white cab roofs and yellow speed whiskers. The whiskers were replaced during the early 1960s by split yellow warning panels, one either side of the central character train describer which remained green.

During the mid 1960s rail blue appeared, and white cab roofs were gradually dispensed with and buffer beams became black. Initially the yellow warning panels were expanded to cover the complete lower front of the driving cabs and later the whole cab fronts became yellow.