Neuerburg Tunnel

Beginning or end of a beautiful railway cycle path at the Neuchâtel tunnel.
Much information.
More information: de.wikipedia.org/wiki/Bahnstrecke_Pronsfeld%E2%80%93Neuerburg?wprov=sfla1

The railway line Pronsfeld-Neuerburg, also called Enztalbahn, was a branch line in the Eifel, which led from the station Pronsfeld at the Westeifelbahn to Neuerburg. The route led from Pronsfeld initially uphill, before she followed the Enz from Arzfeld to Neuerburg.
Source: Wikipedia
Especially for the tunnel there is a historical photo about the tunnel construction (be sure to check it out):
eisenbahn-tunnelportale.de/lb/inhalt/tunnelportale/3102-neuerburg.html

The route rose from Pronsfeld (height 370 meters above sea level) to Arzfeld with numerous curves to 510 meters above sea level. NN at. This required several engineering structures such as the Bierbachtal viaduct, the viaduct at Strickscheid over the K 118 and a bridge at Lünebach. From Arzfeld it ran along the Enz valley, crossed the Weidendell tunnel (length 125 meters) and the Neuerburg tunnel (117 meters) and ended in Neuerburg at 340 meters above sea level. NN.