| Present Location | Chinnor Princes Risborough |
| County Location | Oxfordshire |
| Designed For | BR |
| Built by | Pressed Steel |
| Diagram number | 512 |
| Lot number | 30518 |
| Type | DMBS |
| First Number | 55024 |
| Later Numbers | 960010, 977858 |
| Present Number | W55024 |
| Current Livery | BR Maroon |
| Gauge | 4ft 8 1/2in |
| Wheel Arrangement | 4-w bogies |
| Original Underframe | Yes |
| Original Bogies/Wheelsets | Yes |
| Additional Notes | Single Unit Class 121 "Bubble Car". By 09/13 transferred to Chinnor. Ownership unknown. 03/19: restoration virtually complete ready to go back into traffic for new operating season. |
| External Structural Condition | Good |
| Internal Structural Condition | Good |
| Underframe Condition | Good |
| External Finish | Good |
| Internal Finish | Good |
| Degree of External Originality | As built/last Passenger rebuild (BR or before) |
| Degree of Internal Originality | As built/last Passenger rebuild (BR or before) |
| Degree of Underframe/Running Gear Originality | As built/last Passenger rebuild (BR or before) |
| Degree of External Authenticity | Very Good |
| Degree of Internal Authenticity | Very Good |
| Degree of Underframe Authenticity | Very Good |
| Rarity | Few |
| Historical Importance | no Immediate Importance/Not Applicable |
| Storage | Secure Open |
| Operating | Yes |
| Photo Date | 09/06/2014 |
| Photo by | Alan Tagg |
| At Risk | No |
| Date Record Last Updated | 19/03/2019 |
