Harzquerbahn
The Bielstein Tunnel () is a disused railway tunnel in Saxony-Anhalt in the Harz Mountains of Central Germany. The tunnel is 465.7 metres long and lies between the zig zag of Michaelstein and Braunesumpf. It belonged to the Erzstufen Railway and, from 1885, to the Harz Railway (today the Rübeland Railway).