On the morning of 30th July 1977 55021 (D9021) "ARGYLL & SUTHERLAND HIGHLANDER" gets the previous nights 4E05 19:15 Oxford - Newcastle mail service away from York.
The locomotive had re-engined the service at York, having been removed from the 1E05 09:50 Edinburgh - King’s Cross "The Flying Scotsman" service on the 29th and was en-route back to home depot Haymarket, where it finally arrived on the 31st July, for attention to defects.