Sorry, I only just woke up. As Jordan says, an RMT top on an Atlas chassis. You can find the tops on eBay, but only in the USofA, RMT themselves seem to be losing interest in making stuff.But then there’s the postage, which makes the whole thing a bit silly. So use the proportions and make your own in plastikard. Atlas Plymouths are easier to find this side of the pond, thankfully, and go very well, if a bit noisy.
yes, my thread on the other place has suffered in the great picture crash, whenever we finally move house I intend to put some pictures back, particularly the Easter Parade ones.
https://www.rmweb.co.uk/topic/104716-“route-of-the-shortys”/