Cutaia Unexciting Asset Jam-Subway (Train Car-TJoeT1)

Hey I started remixing this yesterday (just putting spray paint on the outside) and then you updated it lol. I'm not sure but I don't think the old version will work with the new one. Is there a way I can update it without deleting what I did so far?

I remixed it so it can be added to the track! Keep working on it! Two trains will be great!