they go tiny, and they go backwards when landing.

I was thinking about your post for like a day and a half before I realized you're talking about a mod called chonky trains lmao, you mean this one right? https://mods.factorio.com/mod/chonky-trains
I'll have to take a look

yup you got it, thx

tried the new version and it works unless i use a really long chonky train, the pieces separate mid-air. :-(

The hard part is finding a way to make a jumping system that works for all trains in general. In theory I could make a special code for every modded train out there but that's a lot of work for a short term fix. Glad to hear it's behaving a bit better though 😁