I do not think the road name makes a difference as to the ease of removing the window. We have two NS, one CSX and a Chessie. The CSX popped out without loosening the camera in its holder. The Chessie is fine without removing the window. Both NSs loosened the camera in their holder and required either popping the side window out or removing the cupola.
We managed to remove the cupola on one of them without disassembling the entire car. The tabs that hold it on are in the front and rear of the cupola at the centerline of the roof. By wiggling it and pulling up on the cupola we could see it begin to lift up. We then took a flat head screw driver and pushed in on the cupola carefully at the centerline of the roof while continuing to lift up until it finally popped off. After it was disassembled, we snipped off the tabs as suggested by cjack, so that it can be lifted off easily if we need to later.