111.164 headed for Stuttgart with RE 19034, the 10:18 from Singen, on 29 April 2017.
The section of line from Rottweil to Horb follows the Neckar and is the most scenic and photogenic part of the route and where I spent the only sunny day of my visit.
This photo was taken a couple of kilometres south of Sulz am Neckar where the line and river run close together. Access is more straightforward than it looks with farm tracks that double as footpaths following the line all the way.