| Vehicle type: | DMBS | DTCL |
| Classification: | 114 | 114 |
| Original classification: | 114 | 148 |
| Original number range: | 50000-50049 | 56001-56049 |
| Revised number range: | 53001-53049 | 54001-54049 |
| Introduced: | 1956 | 1956 |
| Built by: | BR Derby Works | BR Derby Works |
| Vehicle length (over body): | 64ft 6in | 64ft 6in |
| Height: | 12ft 4 1/2in | 12ft 4 1/2in |
| Width: | 9ft 3in | 9ft 3in |
| Seating: | 62S | 12F/62S |
| Internal layout: | 2+3S | 2+2F/2+3S |
| Gangway: | Inner end | Inner end |
| Toilets: | Not fitted | 1 |
| Weight: | 35 tons 10 cwt | 29-31 tons |
| Brake type: | Vacuum | Vacuum |
| Power unit: | 2 x BUT (Leyland) of 230hp per vehicle | - |
| Horsepower (total): | 460hp | - |
| Transmission: | Mechanical | - |
| Max speed: | 70mph | 70mph |
| Coupling type: | Screw | Screw |
| Multiple restriction: | Blue square | Blue square |
| Door type: | Slam | Slam |
| Special features: | ||
| Body structure: | Steel | Steel |
| Notes: | 50000 originally fitted with two experimental Rolls Royce 238hp engines and hydraulic transmission |