Arosa Line Has Ge 4/4 Il But How Will Reverse Travel Be Handled?

The TS version of the arosa line has a cab control car for reverse travel on it's routes,but this type of car not mentioned for the tsw2 version(Yet)(It could also be a future dlc add on)but either way how would reverse route travel be handled without it?(Maybe switching the loco to the other end at end of route).

 

I assume there is a turntable at each end of the route

 

According to OpenStreetMap, there is a siding thing just north of Chur station which is also where the RhB carries on toward Haldenstein and onward to Davos. And at Arosa, there is a depot and sidings north of the station.