Hello Craig in answer to your enquiry of a Class 31431 standing on the Devon side of the Royal Albert Bridge I regret that I have no knowledge of this in my photo collection. However the same month the first Class 40 40122 arrived at Penzance on the 03.00 from Manchester.
Royal Albert bridge
I hope you are well?
I've sent a Twitter link to you of 31431 apparently stood on the Devon side of the RAB with a short engineering train. Dated November 1985 I wonder if any of our readers remembers it. Did it start from St Blazey?
Another one for Rogers digest, unless it only worked to here wrong Road of course in a possession.
Best wishes , Craig