I was wondering where those locomotives were!

Did they run at the park? Presumably they did, since when he was asked how they got them into the barn, he replied "they're on rails". However, I didn't notice any tracks outside of the barn, nor did I see any coaches, but that could simply be how they edited the shots.

There are tracks in place, in a loop around the park, but I have never found anyone who was for sure the engines ever ran there. But there doesn't seem to be anything else there, cars or miniature train rides...we've been by and you can't see much of anything other than the decaying buildings and rides, but after the grass dies you can make out the track.

Actually, looking closely at my screen grab, I think there's a open coach similar to the ones Crown makes just to the left of the loco, half buried in junk.