| Last Checked or Updated 02 October 2025 |
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D446 | 50046 |  |
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| Photo: K. Connolly - Birmingham New St. 29/05/1977 |
| Loco Specific Information | |||
| Built By | English Electric at The Vulcan Foundry | ||
| Build Number | 3816 / D1187 | ||
| To British Rail / To Service | 29.10.1968 / 02.11.1968 | D446 | |
| TOPS Renumbered | 15.02.1974 | 50046 | |
| Time In Service | 23 years, 4 months | 8,521 days | |
| Engine Hours | 7,889 | ||
| Nameplate | Ajax | Fitted | 11.10.1978 |
| First Noted Working Found | |||
| Works & Exam History | ||||
| 1 | Light Repair | Entry Prior 27.06.1971 / Release 21.08.1971 | ZC | Crewe Works |
| 2 | Light Repair | Entry Prior 12.12.1971 / Release Prior 30.01.1972 | ZC | Crewe Works |
| 3 | Light Repair | Entry Prior 11.06.1972 / Release Prior 06.08.1972 | ZC | Crewe Works |
| 4 | Intermediate | Entry Prior 26.01.1975 / Release 18.03.1975 | ZC | Crewe Works |
| 5 | Light Repair | Entry Prior 04.04.1976 / Release 28.06.1976 | ZC | Crewe Works |
| 6 | Light Repair | Entry Prior 21.08.1977 / Release 28.12.1977 | ZF | Doncaster Works |
| 7 | Intermediate | Entry xx.xx.xxxx / Release 16.04.1980 | ZF | Doncaster Works |
| 8 | Refurbishment | Entry 04.11.1982 / Release 19.03.1983 | ZF | Doncaster Works |
| 9 | Mainframe Crack Repairs | Entry xx.10.1986 / Release xx.11.1986 | ZF | Doncaster Works |
| 10 | Major F Exam | Entry xx.xx.xxxx / Release 11.05.1987 | LA | Laira Depot |
| Last known working before and after a repair | |||
| 1 | |||
| 1 | |||
| 2 | |||
| 2 | |||
| 3 | |||
| 3 | |||
| 4 | |||
| 4 | |||
| 5 | |||
| 5 | |||
| 6 | |||
| 6 | |||
| Last Working | |||
| Post Service | |||
| Withdrawn | 16.11.1991 | ||
| Condemned | 25.03.1992 | ||
| Cut Up | 19.06.1992 | At | M C Metals, Springburn |
| Identification Markings & Notes |
| Allocations / Sectors | |||
| Date | Area / Depot | Depot Code | Time Spent at Depot |
| 25.11.1968 | Allocated to Crewe Diesel | CD | |
| 11.05.1974 | Reallocated to Bristol Bath Road | BR | |
| 07.04.1977 | Reallocated to Laira | LA | |
| 10.1988 | Reallocated to Old Oak Common | OC | |
| 05.1989 | Reallocated to Laira | LA | |
| Sector Code | Sector | ||
| 05.1987 | RXXA | Parcels | |
| 02.10.1988 | NWRA | Network SouthEast - Thames & Chiltern | |
| 14.05.1989 | DCWA | Departmental Western Region | |
| 13.01.1991 | NWXA | Network SouthEast - West of England | |
| Liveries | ||
| Date From | Notes | |
| 25.11.1968 | Standard British Rail Blue | |
| 03.1983 | British Rail Blue Large Logo with Grey Roof | |
| 04.1985 | British Rail Blue Large Logo with Black Roof | |
| Damage / Accidents | |
| 28.10.1971 | Class 50's 413 + 446 while heading the 18.00 1M40 Manchester - Glasgow collided with the rear of an up car carrier which was standing foul of the main |
| line at Oxenholme. The front of 413 was extensively damaged. | |
