Brandleite Tunnel
The 296th longest tunnel in the world
Brandleite Tunnel is a single-bore, double-tracked railway tunnel between the stations of Gehlberg (598 m a.s.l) and Oberhof (639 m a.s.l) in Thuringia. It leads the Neudietendorf–Ritschenhausen railway beneath the Brandleite massif, a part of the ridge of the Thuringian Forest that reaches a height of 897 m a.s.l. in this area. The tunnel is mostly straight, only at the Oberhof end the tracks curve slightly towards the south. With a length of 3,039 m (9, 970 ft) it is the longest railway tunnel in Thuringia, and was the longest in the network of Deutsche Reichsbahn in the GDR. The maximum rock cover amounts to 237 m (778 ft).
Tunnel data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).