| British Railways class D2/12 | |
| Powertype: | Diesel-mechanical |
| Fleetnumbers: | D2510–D2519 |
| Builder: | Hudswell Clarke |
| Serialnumber: | D1201–D1210 |
| Builddate: | 1961 |
| Totalproduction: | 10 |
| Primemover: | Gardner 8L3 |
| Transmission: | fluid coupling and Bostock & Bramley four-speed Power-flow SSS synchro-self-shifting gearbox |
| Whytetype: | 0-6-0 DM |
| Wheeldiameter: | 3feet |
| Locoweight: | 34.2LT |
| Maxspeed: | 24mph |
| Poweroutput: | Engine: 204bhp |
| Tractiveeffort: | 16100lbf |
| Trainheating: | None |
| Multipleworking: | Not fitted |
| Axleloadclass: | Route availability 4 |
| Operatorclass: | D2/12; later 2/14A; no TOPS class |
| Retiredate: | 1967 |
| Disposition: | 6 scrapped, 4 sold NCB (3 scrapped, 1 preserved) |
British Rail Class D2/12 was a class of ten locomotives commissioned by British Railways in England. They were diesel powered locomotives in the pre-TOPS period built by Hudswell Clarke with a Gardner engine. The mechanical transmission, using a scoop control fluid coupling and four-speed Power-flow SSS (synchro-self-shifting) gearbox,[1] was a Hudswell Clarke speciality.
The D2/12 was mechanically similar to the earlier British Rail Class D2/7 but was of more modern appearance. The engine casing was lower, giving much better all-round visibility.
D2519 was employed at NCB Hatfield Main, Doncaster, South Yorkshire[2] as a shunter. It was located there until at least 1984.
D2511 is preserved at the Keighley and Worth Valley Railway.[3]