Twenty-two locomotives were built, which were used for express passenger services on the ECML, particularly from London to and Edinburgh, until 1978 when Class 43 High Speed Trains (HSTs) were introduced. They were subsequently relegated to semi-fast services on the Kings Cross to York, Edinburgh and Hull routes and continued on sleeper services along the ECML. Other occasional destinations, although with no officially diagrammed work, included Cleethorpes, Stockport, Liverpool Lime Street and Aberdeen. They rarely worked to Skegness and Scarborough. Other very unusual destinations included Bridlington, Leicester and a BR "Merrymaker" trip to Fort William. They could be found on diversionary routes such as Newcastle to Edinburgh via Carlisle and Doncaster to Peterborough via Lincoln and Spalding, rarely Cambridge although arriving at Kings Cross via Hertford was not unusual. During the latter years, organised Railtours took them further afield to Worcester, Cardiff, Bognor Regis, Dover, Norwich and Exeter. All were withdrawn from service between January 1980 and December 1981.