The pictures show (1) 37007 and 37178 between Lipson Junction and Mutley Tunnel on a rather murky 7th April 1985. (2) Split box 37007 on the front was a particularly rare Gateshead allocated 'tractor', but this was of no interest to the dejected masses lined up outside the Royal Eye Infirmary at Plymouth who were most definitely not class 37 fans. Green Great Western liveried 50007 Sir Edward Elgar awaits in the siding behind to take the train back to Paddington at 18.15.
As a footnote although steam was banned from BR lines from 1968 to 1985 in Devon and Cornwall, the sole exception to the ban was 4472 Flying Scotsman and this loco did I believe indeed steam over the South Devon banks in 1973 whilst based at Paignton when it required wheel turning at Laira . I do remember Bernard Mills excitedly recollecting this at one of his impressive slide shows and indeed producing the evidence on film !
Regards Clive Smith
Many thanks for your reminiscences and photographs Clive.