I'm talking about after I get the original meshes and permission. What program do I use? This is for myself and I'm planning on not releasing it to the public.
Maybe I'm missing something, but I'm a little confused by these responses.
1. If you have an image of the builder’s plate, you could scale it and paste it onto the skin of locomotive in the proper position. All that would require is a graphics program.
Neither of these methods involve editing or modifying the original mesh in any way. If the license agreement allows reskining for private use the first method is definitely acceptable and I would think that the second is as well. In either case you’d want to work with a clone of the asset.
normally it's just a matter of matter of finding the correct tga file and then scaling down the pic. I have done this with around 80% of the content that I have. There are no legalities for personal use.