Awesome idea!! This is quite different and I haven’t seen many maps in this concept. For the moving sky dome, you don’t have to worry much since if you look at the sky from a moving train, you won’t see much movement in it. This is because of the massive scale of sky relative to the train. But you will have to move the landscape around the train to achieve the sense of motion. Also the closer it is to the train, the faster it will be. I think you don’t even need to have real mesh for landscape. Just fake it using cards if you don’t want the player to get anywhere close to the windows 