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| Date built | 1955 |
| Built by | Park Royal Vehicles |
| Built at | |
| Number built | 20 |
| Status | Preserverd & Scrapped |
| Family name | First generation |
| Owner | Various |
| Operated by | Various |
| Originally operated by | British Rail |
| Original owner | British Rail | Date entered service | 1957–1983 |
| Date refurbished | N/A |
| formation | N/A |
| Capacity | |
| Predecessor | Steam locomotives and carriages; |
| Sucsesser | |
Specifications |
| Maximum speed | 70 mph (110 km/h) |
| Power output | 150 bhp (112 kW) each engine |
| Braking system | Vacuum |
| Safety systems | |
| Coupling system | Screw-link couplings British Standard gangways |
| Multiple working | Blue Square |
| Engine type | Two BUT (AEC) 6-cylinder diesels |
| Unit number | Status | Operater | Owner | Notes |
| 50413 | Preserved | Ecclesbourn Vally Railway | Ecclesbourn Vally Railway | |
| 56160 | Preserved | Private Owner | Private Owner | |
| 56169 | Preserved | Helston Railway | Helston Railway |