Help with switching 3d faces

Hello I’m Attempting to make a Train related game and I made a Thomas model with faces made up of parts that have been unioned.

I realized I didn’t know know how to switch the faces.

I am not a good scripter so I searched all around the internet for answers and the closest I got was using decals.

This is what I want the faces to switch like.
robloxapp-20230903-1721562.wmv (849.1 KB)
If anyone has answers that would be every helpful.

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