The photographer Ron Fisher (no relation) mentions in his index that he's working his way through 15,000 or so colour slides, and also has lots of b&w. He's active over on the Ffestiniog Railway yahoo group, and is still travelling and taking pictures. His 1960s work has been a very useful set of additions in a number of areas, Penryhn and Dinorwig included. Plus I think the pis lower down are the only colour photos I've ever seen of the Nantlle in operation. Somehow I'd always assumed the tractor was a fashionable grey...