Thank you, romualdillo.
Erik, mind that you are looking at something up close and in game it will be not very big detail.
It has been bothering me as well, but will leave that for later when I have seen it in game.
Thinking back at the stairs on the Maxis car ferry / large ferry, then we will have to wait for have it look in game.
The stairs on that was even simpler in the textures. Maybe I need to make the holes darker..... but waiting....
Been mostly working on the general AO-maps.
Then I will start modeling the details, like I showed on the previous page.
Here is an overview of the different roof shape I plan to do:

Please ignore the strange shadow on the roof. The black rectangles on the first cars is where "the holes" are on the carriage (made with alpha) you see in
my previous post.
Looking at that last picture you posted, I am a bit surprice that is more or less the first picture with any sort of
elaborate painted pattern. So far I have seen is what is more or less in my American Passenger Cars.
Most of them have quite plain paint job, some lines, and "band" of color around the windows.