Seikan Tunnel
The is a Japanese funicular line in Sotogahama, Aomori, operated by the Seikan Tunnel Museum. The narrow gauge line descends from the museum near into an underground station on the Seikan Tunnel, which is one of the longest railway tunnels in the world, second to the Gotthard Base Tunnel in Switzerland that opened in June 2016. Transfer to other stations is not possible from the museum.