Salut Marc,
it´s good to have the archaeologist´s eagle´s eye at hand!
So it is this tunnel:
http://home.arcor.de/bluejacket13/bi...ite1_dez90.jpg
But this is according to the railway web site the northern mouth of Schlossberg tunnel - here the Google coordinates:
49.759846,9.523902
49.755895,9.519868
Here we are standing on Baden-Württemberg territory. The tunnel is 617 m long and ends at the other side of the Schlossberg looking over the river Tauber crossed by an railway bridge out of use which is still standing:
http://www.geodaten.bayern.de/Bayern...ayer=TK&step=2
Click the button "Historische Karte" on this webpage and you´ll see the course of this railway. Crossing the Main the tracks reach a 2nd tunnel, the Kaffelstein tunnel (229 m long):
49.763568,9.526466
49.764281,9.529384
http://www.geodaten.bayern.de/Bayern...er=Hist&step=1
Click "Karte" to switch to a current map.
Not to mention the third tunnel some hundreds of meters to the east (Bettingberg tunnel). Though the tunnel is rather narrow ( no attachment of wings possible), this reminds me a lot of WNF´s Diana workshops near Tisinov, production site of the Bf109G-10/U4 (see Japo´s publication)
Is there any progress with the W.Nr.?
Regards
Roland