| Last Checked or Updated 08 June 2026 |
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D439 | 50039 Implacable |
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| Photo: K. Connolly - Raneleigh Bridge 26/08/1975 |
| Loco Specific Information | |||
| Built By | English Electric at The Vulcan Foundry | ||
| Build Number | 3809 / D1180 | ||
| To British Rail / To Service | 09.09.1968 / 14.09.1968 | D439 | |
| TOPS Renumbered | 15.02.1974 | 50039 | |
| Time In Service | 20 years, 8 months, 26 days | 7,573 days | |
| Engine Hours | 6,880 | ||
| Nameplate | Implacable | Fitted | 20.06.1978 |
| First Noted Working Found | |||
| Saturday | 21 November 1970 | 1M30 1200 Glasgow Central - London Euston | DH with 413 between Glasgow Central - Crewe |
| Works History & Service Working (Before & After) | |||||
| 1 — Crewe Works (1970) | |||||
| 1 | |||||
| Before | |||||
| Works | Light Repair | Entry Prior 26.07.1970 / Release 17.10.1970 | |||
| After | |||||
| 2 — Crewe Works (1973) | |||||
| 2 | |||||
| Before | |||||
| Works | Intermediate | Entry Prior 08.04.1973 / Release 16.04.1973 | |||
| After | |||||
| 3 — Crewe Works (1973) | |||||
| 3 | |||||
| Before | |||||
| Works | Light Repair | Entry Prior 05.08.1973 / Release Prior 16.09.1973 | |||
| After | |||||
| 4 — Doncaster Works (1977) | |||||
| 4 | Before | ||||
| Works | Light Repair | Entry Prior 21.08.1977 / Release 07.10.1977 | |||
| After | |||||
| 5 — Doncaster Works (1981) | |||||
| 5 | |||||
| Before | |||||
| Works | Refurbishment | Entry 15.04.1981 / Release 14.09.1981 | |||
| After | |||||
| 6 — Doncaster Works (1985) | |||||
| 6 | |||||
| Before | |||||
| Works | Intermediate | Entry xx.xx.xxxx / Release 15.05.1985 | |||
| After | |||||
| Last Passenger Duty (PD) / Last Working (LW) | |||
| PD | Thursday | 25 May 1989 | 1F56 17:48 Paddington - Oxford |
| LW | Thursday | 25 May 1989 | 1F56 17:48 Paddington - Oxford |
| Post Service | |||
| Withdrawn | 25.05.1989 | ||
| Condemned | 04.06.1989 | Engine | |
| Cut Up | 06.07.1991 | At | Old Oak Common By Coopers Metals |
| Identification Markings & Notes |
| Allocations / Sectors | |||
| Date | Area / Depot | Depot Code | Time Spent at Depot |
| xx.09.1968 | Allocated to London Midland Stoke Division | D05 | |
| xx.05.1973 | Allocated to Crewe Diesel | CD | |
| 11.05.1974 | Reallocated to Bristol Bath Road | BR | |
| 11.1980 | Reallocated to Laira | LA | |
| 04.1982 | Reallocated to Old Oak Common | OC | |
| 05.1987 | Reallocated to Laira | LA | |
| 04.10.1987 | Reallocated to Old Oak Common | OC | |
| Sector Code | Sector | ||
| 05.1987 | NXXA | Network SouthEast | |
| 30.09.1988 | NWRA | Network SouthEast - Thames & Chiltern | |
| Liveries | ||
| Date From | Notes | |
| 09.09.1968 | Standard British Rail Blue | |
| 09.1981 | Large Logo British Rail Blue, Grey Roof | |
| Damage / Accidents | ||||
| Photos | |
| Standard British Rail Blue Unrefurbished | Nameplate |