British Rail Class 11

British Rail Class 11
12077 at the Midland Railway Centre
Power type	Diesel-electric
Builder	LMS/BR Derby & BR Darlington
Build date	1945–1952
Total produced	120
Configuration	0-6-0
UIC classification	C
Gauge	4 ft 8 1⁄2 in (1,435 mm) Standard gauge
Wheel diameter	4 ft ½ in (1.232 m)
Minimum curve	3.5 chains (70 m)
Wheelbase	11 ft 6 in (3.51 m)
Length	29 ft 1 1⁄2 in (8.88 m)
Width	8 ft 5 in (2.57 m)
Height	12 ft 5 1⁄2 in (3.80 m)
Locomotive weight	47.4 long tons (48.2 t)
Fuel capacity	660 imp gal (3,000 l; 790 US gal)
Prime mover	English Electric 6KT
Generator	English Electric 801 — 441 A, 430 V
Traction motors	English Electric 506, 2 off
Cylinders	Straight 6
Transmission	DC generator, DC traction motors, double reduction gearing
Multiple working	Not fitted
Top speed	20 mph (32 km/h)
Power output	Engine: 350 hp (261 kW)
Tractive effort	Maximum: 34,900 lbf (155.2 kN)
Train heating	None
Locomotive brakeforce	32.2 LTf (321 kN)
Train brakes	Vacuum
Career	War Department Nederlandse Spoorwegen (NS) London, Midland and Scottish Railway British Railways HNRC heritage railways
Number in class	WD: 14 (10 to NS) LMS/BR: 106
Number	WD: 70260–70273 LMS: 7120–7129 BR: 12033–12138
Axle load class	RA 5

The British Rail Class 11 was applied to a batch of diesel shunting locomotives built from April 1945 to December 1952, based on a similar earlier batch built by the London, Midland and Scottish Railway (LMS) between 1939 and 1942.

Overview

Numbering

The fourteen locomotives were built for the War Department, with the first ten subsequently going the Nederlandse Spoorwegen as NS 501–510. LMS numbers 7120–7129 went straight into LMS stock, with 7129 being the last diesel shunter to be built for the LMS. British Railways continued to build the class from 1948 to 1952, using numbers M7130–M7131 and 12045–12138. 7120–7129 and M7130–M7131 became BR numbers 12033–12044. The whole class of 12033–12138 became Class 11. Locomotives up to 12102 were built at LMS/BR Derby and 12103–12138 at BR Darlington.

Export locomotives

Main articles: NS 500 Class, NS 600 Class, and Victorian Railways F class (diesel)

Close to 100 almost identical machines were built by English Electric and supplied to Nederlandse Spoorwegen (NS) as their 500 Class & 600 Class diesel locomotives. Sixty-five of the 600 Class locomotives were built by English Electric between 1950 and 1957, numbered 601–665, at either Dick, Kerr & Co. Works (601–610) in Preston or Vulcan Foundry Works (remainder) in Newton-le-Willows.

Another export order was to Australia, with 16 locomotives built for use on 5 ft 3 in (1,600 mm) broad gauge in 1951. Victorian Railways bought ten as the F class, while six were bought by the State Electricity Commission of Victoria.

Technical details

The diesel engine is an English Electric 6-cylinder, 10-inch bore by 12-inch stroke (254 mm by 305 mm); 4-stroke, 6KT and the traction motors are two: EE506 axle-hung, nose-suspended, force-ventilated traction motors with 21.7:1 double reduction gear drive. The main generator is an English Electric EE801, 441 A at 430 V.

Post-BR use

The following locomotives are, or were, at Harry Needle Railroad Company (HNRC):

• 12074 Scrapped
• 12088 Operational
• 12098 Scrapped

Preservation

The following Class 11 diesel shunters are preserved:

• 12052 at Caledonian Heritage Railway
• 12061 by Heritage Shunters Trust at Peak Rail
• 12077 at Midland Heritage Railway
• 12083 at Battlefield Line Railway
• 12093 at Caledonian Heritage Railway
• 12099 at Severn Valley Railway
• 12131 at North Norfolk Railway
• 12139 at North Yorkshire Moors Railway

• A ninth example 12049 (renumbered from 12082) is preserved at the Watercress Line in Hampshire. At one time it was re-registered as 01553, in TOPS Class 01/5, carried both numbers and was owned by the Harry Needle Railroad Company. 12082 was renumbered to 12049 in October 2010 and painted in BR green with a late crest but without the yellow/black ends. This was as a replacement for the original Mid Hants locomotive 12049 [1] that was scrapped after suffering catastrophic damage during an engine shed fire on 26 July 2010.

See also

• LMS diesel shunters

References

• Strickland, David C. (September 1983). Locomotive Directory. Camberley, Surrey: Diesel and Electric Group. pp. 51–52. ISBN 0-906375-10-X. 

Further reading

• McManus, Michael. Ultimate Allocations, British Railways Locomotives 1948 - 1968. Wirral. Michael McManus.