The Flåm Line (Norwegian: Flåmsbana) is a 20.2-kilometer (12.6 mi) long railway line between Myrdal and Flåm in Aurland, Norway.
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A branch line of the Bergen Line, it runs from Myrdal through the valley of Flåmsdalen and connects the mainline with the village Flåm on the Sognefjord. The line’s elevation difference is 863 meters (2,831 ft); it has ten stations, twenty tunnels and one bridge. The maximum gradient is 5.5 percent (1:18). Because of its steep gradient and picturesque nature, the Flåm Line is now almost exclusively a tourist service and has become the third-most visited tourist attraction in Norway (Wikipedia).
Read more about this attraction at the Visit Flåm website.