After the fixes on the Rapid Transit Rout including the PZB fix, I found a new issue. Somehow the texture of the PIS is staged around the whole front window and, if this issue occurs the taillight isn't working either. In front everything is normal. I have seen AI with the same issue, but the other way around. The front was like this and the back was ok.
These were reported a few days ago, it's likely something very simple, a missing comma or other symbol that separates the various textures in the code, so instead of the FIS text going in the box at the top of the window, it's jumped to the next texture, i.e. the windscreen surround.