British Rail Class D1/1

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.

British Rail Class D1/1
Type and origin
Power typeDiesel-mechanical
BuilderHunslet Engine Company
Serial number4625–4627
Build date1954–1955
Total produced3
Specifications
Configuration:
​
 • Whyte0-4-0DM
 • UICB-dm
Gauge4 ft 8 1⁄2 in (1,435 mm) standard gauge
Wheel diameter3 ft 4 in (1.016 m)
Minimum curve
  • 0.91 chains (18.306 m) normal
  • 0.74 chains (14.886 m) dead slow
Wheelbase5 ft 6 in (1.676 m)
Length20 ft 10 1⁄2 in (6.363 m)
Width11 ft 0 in (3.353 m)
Height20 ft 10 1⁄2 in (6.363 m)
Axle load11.25 long tons (11.43 t)
Loco weight22.45 long tons (22.81 t; 25.14 short tons)
Fuel typeDiesel
Fuel capacity100 imperial gallons (450 l; 120 US gal)
Prime moverGardner 6L3
Engine RPM:
 • Maximum RPM		1200 rpm
Engine typeFour-stroke diesel
CylindersSix
TransmissionMechanical, Hunslet patent friction clutch, Hunslet four-speed gearbox
MU workingNot fitted
Train heatingNone
Loco brakeAir
Train brakesNone
Performance figures
Maximum speed14 mph (23 km/h)
Power outputEngine: 153 bhp (114 kW)
Tractive effort:
​
 • Continuous10,800 lbf (48.0 kN) at 4.5 mph (7.2 km/h)
Brakeforce16 long tons-force (160 kN)
Career
OperatorsBritish Railways
ClassDY1; later D1/1; later 1/15. No TOPS class.
Numbers11500–11502; D2950–D2952 from 1957
Axle load classRoute availability 1
LocaleNorth Eastern Region
Withdrawn1966–1967
DispositionOne sold to industry then scrapped, two scrapped

History

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] 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Withdrawn in 1967 as part of a purge on non standard shunters, D2951 and D2952 were cut up in 1968.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]

Table of withdrawals
YearQuantity in
service at
start of year		Quantity
withdrawn		Locomotive numbersNotes
196631D2952
196722D2950-51D2950 went into industrial use.

Models

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

Notes
  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". Archived from the original on 5 May 2013. Retrieved 17 November 2012.

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