W.German n.g. in the 1950's - British photographers sought

I have been approached by a member of the Drehscheibe forum concerning a forthcoming exhibition at the Märkische Museumsbahn in the Sauerland. He would like to exhibit photos of the local narrow gauge lines, taken in the late 1950's by the following photographers/authors, with whom he has been unable to establish contact. Any assistance would be appreciated:

Executors of Ronald Capson (+1994)

Peter Bowyer (Southampton?)

Max Sinclair

 

Hello,

Is that Ronald Copson (with an "o" not an "a")? There are many colour pictures of trams in various German books. Maybe the authors have an idea.

Regards

Christoph