the railway providing the motors from Stuttgart runs nearly in South to North direction protected by the Tauber Valley.
http://web2.cylex.de/stadtplan/werth...helsteige.html
see the road cossing the river. it was a combined railway road bridge.
on the northern side of the river Kreuzwertheim Railway station.
Tunnel entrance is just at the South of the bridge, the assembly of Messerschmitts was at Eichelsteige, at least the motors were stored there