British Rail Class D1/1

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British Rail Class D1/1
Type and origin
Power type Diesel-mechanical
Builder Hunslet Engine Company
Serial number 4625–4627
Build date 1954–1955
Total produced 3
 • Whyte 0-4-0DM
 • UIC B-dm
Gauge 4 ft 8 12 in (1,435 mm) standard gauge
Wheel diameter 3 ft 4 in (1.016 m)
Minimum curve
  • 0.91 chains (18.306 m) normal
  • 0.74 chains (14.886 m) dead slow
Wheelbase 5 ft 6 in (1.676 m)
Length 20 ft 10 12 in (6.363 m)
Width 11 ft 0 in (3.353 m)
Height 20 ft 10 12 in (6.363 m)
Axle load 11.25 long tons (11.43 t)
Loco weight 22.45 long tons (22.81 t; 25.14 short tons)
Fuel type Diesel
Fuel capacity 100 imperial gallons (450 l; 120 US gal)
Prime mover Gardner 6L3
Engine RPM:
 • Maximum RPM
1200 rpm
Engine type Four-stroke diesel
Cylinders Six
Transmission Mechanical, Hunslet patent frction clutch, Hunslet four-speed gearbox
MU working Not fitted
Train heating None
Loco brake Air
Train brakes None
Performance figures
Maximum speed 14 mph (23 km/h)
Power output Engine: 153 bhp (114 kW)
Tractive effort:
 • Continuous 10,800 lbf (48.0 kN) at 4.5 mph (7.2 km/h)
Brakeforce 16 long tons-force (160 kN)
Operators Eastern Region of British Railways
Class DY1; later D1/1; later 1/15. No TOPS class.
Numbers 11500–11502; D2950–D2952 from 1957
Axle load class Route availability 1
Withdrawn 1966–1967
Disposition One sold to industry then scrapped, two scrapped

British Rail Class D1/1 (formerly DY1) was a class of locomotive commissioned by British Rail in England. It was a diesel locomotive in the pre-TOPS period built by the Hunslet Engine Company with a 153 horsepower (114 kW) Gardner 6L3 engine.

The design was specifically designed to work dockside tramways and was ordered by the Eastern Region of British Railways to carry out this work. Equipped with a 5 ft 6 in (1.68 m) wheelbase it could work the tight curves and awkward nooks and crannies of East Anglian dock systems.

Early on in their lives the locomotives were initially allocated to Ipswich Engine Shed[1][2][dubious ] and were fitted with cow catchers for working the dockside tramway lines. As time passed and traffic levels declined at Ipswich, they were transferred away from Ipswich with D2950 being recorded at Great Yarmouth (which had a quayside tramway) and D2951 at Goole which had a dock system. D2950 and D2951 were both transferred from Ipswich to Goole in December 1966.

Withdrawn in 1967 as part of a purge on non standard shunters, D2951 and D2952 were cut up in 1968. D2950 survived in industrial use at Llanelli before being cut up in 1983.[3]


Class D1/1 is being made as a kit and a ready-to-run model in OO gauge by Silver Fox Models.[4]

See also[edit]


  1. ^ Haresnape, Brian (October 1984). British Rail Fleet Survey 7: Diesel Shunters. Shepperton: Ian Allan. p. 44. ISBN 0-7110-1449-3. GE/1084. 
  2. ^ "D1/1 0-4-0". BRDatabase. 
  3. ^ Butlin, Ashley; Webster, Neil (1993). Locomotive Lexicon. ISBN 0-947773-37-1. 
  4. ^ "D2950 Hunslet 0-4-0 Docks Shunter". Retrieved 17 November 2012. 


  • Ian Allan ABC of British Railways Locomotives (Winter 1962/3 ed.). p. 203.