Open asset editor and create a new vehicle. Use the train and car as templates, and in color variation menu on the right, select 4 variations as the same color of your choice (or same color as the body so line will be invisible)

Hi REV0!
I really like this train as it looks very similar to trains from Sydney, which at the moment I am trying to recreate in Cities Skylines. The only thing I would like to change about this model so far is to get rid of the line colour and still keep the updated textures etc, but I am not sure of how to do this. Would you be able to help me find out the steps and the tools/software I need for this?
Thank you so much.

Im colorblind :/

Tolle Züge, sehr gut gelungen bis auf das, dass die Züge nicht grau/ gelb sondern grau/ grün sind

Prop pack is released: http://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=971479410