Here are three photographs that I took, on 35 mm slide film, of Class 50s in the early 1980s.
The first one, I believe, is 50017 Royal Oak at Exeter St Davids having just arrived with a train from Waterloo.
This photograph was taken in the summer of 1980, not long after the fleet had taken over the Waterloo to Exeter services, in May 1980.
The middle photograph is of a rather dirty 50003 'Temeraire' standing at Paddington with a train from Oxford. This was taken in the spring of 1981.
Finally we have 50037 'Illustrious' about to depart Waterloo with a train for Exeter St Davids on a wet summer's day in 1980.