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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 type Diesel-mechanical Builder Hunslet Engine Company Serial number 4625–4627 Build date 1954–1955 Total produced 3
Specifications Configuration: ​  • Whyte 0-4-0DM  • UIC B-dm Gauge 4 ft 8+1⁄2 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+1⁄2 in (6.363 m) Width 11 ft 0 in (3.353 m) Height 20 ft 10+1⁄2 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 friction 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)
Career Operators 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 Numbers 11500–11502; D2950–D2952 from 1957 Axle load class Route availability 1 Locale North Eastern Region Withdrawn 1966–1967 Disposition One sold to industry then scrapped, two scrapped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Withdrawn in 1967 as part of a purge on non standard shunters, D2951 and D2952 were cut up in 1968.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 (at Thyssen (Great Britain) Ltd.) and was marked for preservation in 1982 [3] before being cut up in 1983.[4]

Table of withdrawals

Year	Quantity in service at start of year	Quantity withdrawn	Locomotive numbers	Notes
1966	3	1	D2952
1967	2	2	D2950-51	D2950 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.[5]

See also

• List of British Rail classes

Notes

References

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

Further reading

• British Railways Shunting Diesel Locomotive Diagrams (PDF). Barrowmore MRG. Swindon: British Railways Board. May 1962. p. 3 (per pdf).

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