when I select the destination sation in the BR 146.3 using the PIS over the windshield it does not show anything on the exterior of the train (yes I have cliked confirm the destiation)
Yeah it is a bit bugged, as a workaround you can go to free camera with 8 and then go far away so that when you return to the cab(1) or train(2 or 3) you get a loading screen, then you will see the destination sign properly.