Main line Koblenz Cologne (on the left, some track maintenance work is going on) and branch line to Kalenborn. This line has very steep gradients (up to 6%, I believe) as you can see on the right if you look carefully.  Nowadays it is only used for museum trains.  Oct. 2005 (c) J. C. Stiller (stiller_the_at_symbol_brain.uni-freiburg.de)