Don't have any mods that change how the vehicles actually work, so the mod itself is broken.

Failed to load mods: kj_vehicles/data-final-fixes.lua:571: attempt to index field '?' (a nil value)
stack traceback:
kj_vehicles/data-final-fixes.lua:571: in main chunk

New update should fix it

New update gives:
Failed to load mods: kj_vehicles/data-final-fixes.lua:571: attempt to index field 'curved-rail' (a nil value)
stack traceback:
kj_vehicles/data-final-fixes.lua:571: in main chunk

it was working in previous version

I'm looking into it. It has nothing to do with the previous error btw and couldn't have been working in previous versions since that particular code didnt change

Should be fixed, pls tell me if it works for you