Matterhorn Gotthard Bahn in the context of "Gornergrat Railway"

The Furka Oberalp Railway (German: Furka Oberalp Bahn) is a narrow gauge mountain railway in Switzerland with a gauge of 1,000 mm (3 ft 3+3⁄8 in). It runs in the Graubünden, Uri and Canton of Valais. Since January 1, 2003, it is part of the Matterhorn Gotthard Bahn when it merged with the BVZ Zermatt-Bahn.

The line begins in Disentis in the canton of Graubünden, where there is a connection to the Rhätische Bahn (RhB). It then runs over the Oberalp Pass to Andermatt in the canton of Uri. Through the Furka Base Tunnel it reaches the Goms District area and Brig in the canton of Valais. In Brig, it connects to the BVZ Zermattbahn since 1930.

The Furka Base Tunnel is a Swiss railway base tunnel on the Matterhorn Gotthard Bahn's Furka–Oberalp line, an east–west railway connecting the cantons of Valais and Uri. Its west portal lies east of Oberwald (VS), at 1,390 m (4,560 ft) above sea level and its east portal lies south of Realp (UR), at 1,550 m (5,090 ft).

Prior to its construction, all traffic had to use the historic high-level route via the 1.8 km (1.1 mi) long Furka Summit Tunnel, which was only available seasonally due to the threat posed by heavy snowfalls. Construction commenced during 1971, taking ten years to complete. An innovative permanent support system was used, comprising rock anchors and a shotcrete coating, which included the first use of polyurethane-based grouting within a railway tunnel. The tunnel has a relatively narrow cross section, which has been attributed with slowing the construction effort somewhat. The interconnecting Bedretto tunnel was used during the Furka Base Tunnel's construction for the removal of excavating spoil as well as to moving supplies inwards; it has since been reused for ventilation.