| style="color:yellow; background:#0B4559; border-bottom:3px solid" colspan="3" align="center"|BR Class 11 |
| tyle="color:white; background:#0B4559"|TOPS numbers | colspan="2"|None |
| tyle="color:white; background:#0B4559"|Early numbers | colspan="2"|12033-12138 (see notes) |
| tyle="color:white; background:#0B4559"|Builder | colspan="2"|LMS/BR Derby & BR Darlington |
| tyle="color:white; background:#0B4559"|Introduced | 1945-52 | |
| tyle="color:white; background:#0B4559"|Wheel Arrangement | 0-6-0 | |
| tyle="color:white; background:#0B4559"|Weight | 47 t 5 cwt | 48,008 kg |
| tyle="color:white; background:#0B4559"|Height | 12 ft 5 1/2 in | 3.8 m |
| tyle="color:white; background:#0B4559"|Width | 8 ft 5 in | 2.6 m |
| tyle="color:white; background:#0B4559"|Length | 29 ft 1 1/2 in | 8.9 m |
| tyle="color:white; background:#0B4559"|Wheel Dia. | 4 ft 0 1/2 in | 1.2 m |
| tyle="color:white; background:#0B4559"|Wheel Base | 5 ft 9 in + 5? 9? | 1.8 m |
| tyle="color:white; background:#0B4559"|Minimum radius | 3.5 chains | 70.4 m |
| tyle="color:white; background:#0B4559"|Maximum speed | 20 mph | 32 km/h |
| tyle="color:white; background:#0B4559"|Engine output | 350 hp at 680 rpm | 260 kW |
| tyle="color:white; background:#0B4559"|Max. Tractive Effort | 34,900 lbf
later given as 33,500 lbf by BR | 155 kN
149 kN |
| tyle="color:white; background:#0B4559"|Cont. Tractive Effort | || |
| tyle="color:white; background:#0B4559"|Brake type | Vacuum | |
| tyle="color:white; background:#0B4559"|Brake force | 32.73 te | 326 kN |
| tyle="color:white; background:#0B4559"|Route availability | colspan="1"| |
| tyle="color:white; background:#0B4559"|Fuel Tank | 660 imp gal | 3,000 litre |
| tyle="color:white; background:#0B4559"|Heating type | colspan="2"|None |