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| Operator: | United Automobile | Fleet No: | BU503 |
| Chassis: | Bristol MW5G | Chassis No: | 135.012 |
| Body: | ECW B45F | Body No: | 9817 |
| 1957 | United Automobile Services Limited, Darlington (BU503) |
| Jun 58 | In service with United Automobile Services Limited, Darlington (BU503) |
| Nov 64 | Fleet number changed to U503 |
| Mar 65 | Converted to DP39F |
| Mar 65 | Fleet number changed to UE503 |
| Mar 65 | Repainted in Red and Cream |
| Mar 68 | Converted to B45F |
| Mar 68 | Repainted in Red Bus livery |
| Mar 68 | Fleet number changed to U503 |
| Jan 69 | Fleet number changed to 2503 |
| Mar/May 69 | Converted to OMO |
| Nov 74 | Repainted in Poppy Red and Cream |
| <Mar 76 | Transferred to Bishop Auckland |
| Jan 76 | Out of service with United Automobile Services Limited, Darlington (2503) |
| Oct 77 | Unidentified Owner (dealer) |
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Owner : United Automobile UE503 Location : Not Known Date : Not Known
(C) Brian Botley |
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Owner : United Automobile 2503 Location : Valley Bridge Bus Station, Scarborough Date : 1973
(C) Ian Wilson |