On MSB on the destinations boards on trains like show here They only show RB/RE To Aschaffenburg and Guemuinden But in real life (i dont know about when this route was set as the route is set some time ago i think 2007) they go east to hanau and frankfurt and west to wuirzburg, every other route in the game shows the destion of were it accuatlly goes even if the destination is out of the playable area
Some services to terminate at gemunden and Aschaffenburg so maybe the team will add the correct destinations in the future