Gulfoss Tunnel is a 701-meter (2,300 ft) railway tunnel situated in the municipality of Melhus in Trøndelag county, Norway. The tunnel runs beneath the village of Hovin, alongside the river Gaula past the Gulfossen waterfall. The tunnel carries a single, electrified track of the Dovrebanen railway line. The Trondhjem–Støren Line, which opened in 1864, crossed the river Gaula on a bridge to the opposite side of the river at the current site of the tunnel. This section of track was a challenge due to regular flooding. With the 1908 decision to build the Dovrebanen Line and gauge conversion, the Gulfossen section became one of two parts of the line to be reworked. Gulfoss Tunnel opened on 6 July 1918.