British Rail Class 11
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| BR Class 11 | ||
|---|---|---|
| TOPS numbers | None | |
| Early numbers | 12033-12138 (see notes) | |
| Builder | LMS/BR Derby & BR Darlington | |
| Introduced | 1945-52 | |
| Wheel Arrangement | 0-6-0 | |
| Weight | 47 t 5 cwt | 48,000 kg |
| Height | 12 ft 5 1/2 in | 3.80 m |
| Width | 8 ft 5 in | 2.57 m |
| Length | 29 ft 1 1/2 in | 8.88 m |
| Wheel Dia. | 4 ft 0 1/2 in | 1.23 m |
| Wheel Base | 5 ft 9 in + 5 ft 9 in | 1.75 m + 1.57 m |
| Minimum radius | 3.5 chains | 70.4 m |
| Maximum speed | 20 mph | 32 km/h |
| Engine output | 350 hp at 680 rpm | 260 kW |
| Max. Tractive Effort | 34,900 lbf later given as 33,500 lbf by BR |
155 kN 149 kN |
| Cont. Tractive Effort | ||
| Brake type | Vacuum | |
| Brake force | 32.73 te | 326 kN |
| Route availability | 5 | |
| Fuel Tank | 660 imp gal | 3,000 litre |
| Heating type | None | |
The British Rail Class 11 was applied to a batch of locomotives built from April 1945 to December 1952, based on a similar earlier batch.
[edit] Overview
LMS numbers 7120-7125 went to the War Department and then into LMS stock. LMS numbers 7126-7129 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 1948-1952, being numbered M7130/1 and 12045-12138. 7020-7129, M7130 & M7131 became BR numbers 12033-12042. 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 & supplied to the Nederlandse Spoorwegen (NS) as their 500 Class & 600 Class diesel locomotives. Sixty-five of the 600 Class locomotives were built, numbered 601-665. They were built by English Electric between 1950-1957 at either Dick, Kerr & Co. Works (601-610) in Preston, or Vulcan Foundry Works (rest) in Newton-le-Willows.
The engine is an English Electric 6-cyl, 10 in bore by 12 in stroke (254 by 305 mm); 4-stroke, 6KT and the traction motors are 2 x 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.
