218.406 approached Wattenweiler with IRE 4215, the 11:00 Stuttgart Hbf to Lindau Hbf, during a rare sunny break on 6 May 2017.
All the way from Ulm, the line has followed the Donau, which flows east to the Black Sea, and its tributary, the Riß. At Wattenweiler it crosses to the valley of the Schussen, which flows into Bodensee then, via the Rhein, into the North Sea.
218.406 had its own watershed moment the following day when it dumped all its transmission oil at Ravensburg.