Had another look around, here's an auction for a sealed one. Looks like it was sold with some dogbones to help you connect to it's all female connectors.
https://www.jauce.com/auction/h404076889
I can't tell if it's bigger than the Thomas one, it doesn't seem like it's long enough to be a straight and a half... the designs to the side of the track on the table look like they're the same as the Thomas one, including the stop/go switch, although the overhead support and engine stoppers are a different design. The spaces between track connections is definitely less than the later one.
https://www.jauce.com/auction/h404076889
I can't tell if it's bigger than the Thomas one, it doesn't seem like it's long enough to be a straight and a half... the designs to the side of the track on the table look like they're the same as the Thomas one, including the stop/go switch, although the overhead support and engine stoppers are a different design. The spaces between track connections is definitely less than the later one.
I have a website where I have been writing about and photographing many of the sets and pieces that I find interesting.