With this program you can easily edit the colors of the cars. For each machine, you can edit the color sets, add new or delete is not appropriate. You can also edit the color palette-any of the 126.
All you need to do is run the program and open the file (File-Open >) carcols.dat.
This file is located in the data folder, which is located in the folder with the game.
After you modify the file you want to save (File-Save >).