| 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 | 48,008 kg
|
| Height | 12 ft 5 1/2 in | 3.8 m
|
| Width | 8 ft 5 in | 2.6 m
|
| Length | 29 ft 1 1/2 in | 8.9 m
|
| Wheel Dia. | 4 ft 0 1/2 in | 1.2 m
|
| Wheel Base | 5 ft 9 in + 5? 9? | 1.8 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 |
|
| Fuel Tank | 660 imp gal | 3,000 litre
|
| Heating type | None
|
British Rail Class 11 was applied to a batch of locomotives built from April 1945 to December 1952, based on a similar earlier batch.
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.
The engine is an English Electric 6-cyl, 10? bore by 12? stroke; 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.
