These are the most recent shot I have of a double engines wheels. Not great but the purpose of the pictures was to show the engine with my shiny new draincocks in places

This image just make me laugh to think of those that get on their high horse about diameters. All four are nominally the same, yet the nearest pair are noticeably larger than the other pair. Nearer pair are Taliesin's and the other pair are two on Merddin's. The farthest wheel is a Garrat pony truck wheelset.