Slowly, gentlemen, slowly
Schlossbergtunnel may be the solution. But this building is just the beginning of an abandoned railway line leading from Wertheim to Lohr am Main.
Two further tunnels are joining north of Schloßberg, close to Wertheim but within the confineries of
Kreuzwertheim; Kaffelsteintunnel and Bettingbergtunnel. Because of the same engineering the tunnels are quite similar:
http://home.arcor.de/bluejacket13/xs...hrerbahn2.html
This may not seem important but Wertheim is a "border"town, Kreuzwertheim being already on the Bavarian side of the river Main. So any sites north of the Main would be listed after the war under "Bavaria" for this tunnels, but the rest (like Schlossbergtunnel) under "Baden-Württemberg" or "Württemberg-Baden".
As we have seen, distance is no problem for airplane transport and there´s still the railway leading from any tunnel to Wertheim.
Fliegerhorst Wertheim is situated on a plateau above the city itself.
Why all this? Before we are thinking about how Bodenwöhr-Mappach or Cham-Michelsdorf worked we have to find out how Wertheim was linked to the Mtt system.
Otoh the equipment of Wertheim site might have been so poor that it hadn´t been listed in the reparation files.
Regards
Roland
Edit: The designation
Kreuzwertheim may be interesting, too. As we have known, Nazi administration named the next-larger city and allied troops did not make any difference or did not notice it.