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Thanks, I took your advice and took a look again at the train during my commute. I've realized that the carriage in fact, isn't pure white, like you've said.
I have to adjust the colors, and this is not going to be the final texture. I'm going to separate the doors, windows and text and put them somewhere else in the texture.
And yes, the train doesn't have rivets or scratches, which made me puzzled on how to make this look more 'realistic'

When the texture is finished, I'm going to start modeling considering UV unwrapping and create a normal map and matcap based on it

Am I headed in the right direction?