| Present Location | LT Museum Acton |
| County Location | London |
| Designed For | Metropolitan District |
| Built by | Gloucester |
| Diagram number | G |
| Type | DM |
| First Number | 662 |
| Later Numbers | 274, 4184 |
| Present Number | 4184 |
| Gauge | 4ft 8 1/2in |
| Wheel Arrangement | 4-w bogies |
| Original Underframe | Yes |
| Original Bogies/Wheelsets | Yes |
| Additional Notes | Built as G Class DM: renumbered 274 in 1929: 4184 (Q23 stock) 1934. 660 v 4 rail monitor roof EMU. After withdrawal, P by its builder, displayed outside factory; later to Gloucs City Council; donated by them: to Ealing Common 02/93, then to Acton Museum. To Acton Works by 01/10. Still there, stored, 11/13. 04/17: still stored at Acton Works. 11/18: by then had moved to LT Museum Acton from Acton Works and sheeted over outside. 09/22: still sheeted over outside. |
| Owner | London Transport Museum |
| External Structural Condition | Satisfactory |
| Internal Structural Condition | Satisfactory |
| Underframe Condition | Satisfactory |
| External Finish | Satisfactory |
| Internal Finish | Satisfactory |
| 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 | Fair |
| Rarity | Few |
| Historical Importance | Some Importance |
| Storage | Secure Building |
| Operating | No |
| Survey Date | 14/10/1999 |
| Surveyor | Paul Holroyd |
| Photo Date | 09/02/2003 |
| Photo by | Byron Chamberlain |
| At Risk | No |
| Date Record Last Updated | 14/11/2022 |
