Half way through its visit to Doncaster Works 55021 (D9021) "ARGYLL & SUTHERLAND HIGHLANDER" powers the Doncaster test train, through Gateshead, on its way back to Doncaster on the 21st March 1978. The locomotive had arrived at Doncaster on the 14th March for electrical faults and wasn't released until the 30th of the month.