British Rail Class 11

British Rail Class 11

12099 preserved on the Severn Valley Railway

Type and origin Power type Diesel-electric Builder LMS/BR Derby & BR Darlington Build date 1945–1952 Total produced 120

Specifications Configuration 0-6-0 UIC class C Gauge 4 ft 8 1⁄2 in (1,435 mm) standard gauge Wheel diameter 4 ft 0 1⁄2 in (1.232 m) Minimum curve 3.5 chains (70.41 m) Wheelbase 11 ft 6 in (3.505 m) Length 29 ft 1 1⁄2 in (8.88 m) Width 8 ft 5 in (2.565 m) Height 12 ft 5 1⁄2 in (3.797 m) Loco weight 47.4 long tons (48.2 t; 53.1 short tons) Fuel capacity 660 imp gal (3,000 l; 790 US gal) Prime mover English Electric 6KT Generator English Electric 801 — 441 A, 430 V DC Traction motors English Electric 506, DC, 2 off Cylinders Straight 6 Transmission Diesel-electric, double reduction gearing MU working Not fitted Train heating None Loco brake Air

Performance figures Maximum speed 20 mph (32 km/h) Power output Engine: 350 hp (261 kW) Tractive effort Maximum: 34,900 lbf (155.2 kN) Loco brakeforce 32.2 long tons-force (321 kN)

Career Operators War Department Nederlandse Spoorwegen (NS) London, Midland and Scottish Railway British Railways National Coal Board HNRC Imperial Chemical Industries (ICI) heritage railways Number in class WD: 14 (10 to NS) LMS/BR: 106 Numbers WD: 70260–70273 LMS: 7120–7129 BR: 12033–12138 Axle load class RA 5 Withdrawn 1967–1971 Disposition 8 preserved, remainder scrapped

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 1934 and 1936.

An initial batch of twenty locomotives was built during World War II, fourteen of which were built for the War Department, with the first ten of these (70260-70269) subsequently going to the Nederlandse Spoorwegen post-war as NS 501–510. LMS numbers 7120–7126 went straight into LMS stock, and a follow-up batch was built, 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.

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. In addition to the exported 501-510 mentioned above, 500 Class also included 511-545. 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. A further batch of 15 locomotives were exported without engines so that they could be fitted as such in the Netherlands. These were numbered 701-715.