| No. | Class | F.M. Whyte | Gauge | Railroad Line | Location | Status | Builder Info | Notes |
|---|---|---|---|---|---|---|---|---|
| 66 | X1 | 2-2-4T | 4'-8½" | North Eastern (LNER) | National Railway Museum, York, ENG | display | Gateshead Works, 1869 | Named Aerolite. Originally built as a 2-2-2WT type. Previously converted to a 4-2-2T type in 1892. Converted again to 2-2-4T in 1902. Last operational 2-cylinder compound locomotive in service in the UK prior to its retirement. |