I know you want to keep the integrity of the train and are not allowing alterations of the end of the train except to put in a triple window on the end cars. I am working on the observation deck of the Royal Scotsman, which is the end car. Is this too much of a deviation, considering it is suppose to have a deck on the end?
https://cianesimshome.files.wordpress.com/2020/01/screenshot-4-2-e1578681670315.jpg
Adding the tall windows on the end keep that yellow stripe look on the ends of the doors. (One of the wall paper sides does wrap around that wall edge without a wall there, but the other does not.) Of course, I could make the deck one tile smaller so it's only one tile wide. Or I could keep the original rear and just have tall windows either side the center door, but maybe without those fat columns that would block the view? Should I do different options for you to see what you like best?