40122 is being uncoupled from it's train at Manchester Piccadilly. A couple of young gricers manage to 'cab' the loco.
This was the SEG / RCTS 'Buxton Belle' railtour. The trip had originated at Waterloo and would include haulage by classes 73, 45, 20, 37, 40 and 85.
Slide dated 8/6/85.
More details available here:-
http://www.sixbellsjunction.co.uk/80s/850608se.htm