I've always wanted a good history of the Trolleys - who made them, how many versions, and the number of them. (I've read a first-hand account of a unit being damaged during an on-set visit and immediately replaced with a backup.)
Here is, I believe, the original, so that one clearly wasn't modified after the early shows. I think this is in a museum in Canada; I found this picture years ago on the 'net.
