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The Arosa line runs 25km into the mountains south of Chur, climbing 1155m to the resort of Arosa. It is largely a self contained operation, running from its own platforms on Chur station forecourt with a connection across the standard gauge line east of the station to allow the transfer of rolling stock.
The Arosabahn was opened in 1914 and was merged with the RhB in 1942 but retained its own motive power and a 2400V DC overhead system until 1997. Since conversion to 11kV AC, standard RhB traction has been used, with Ge4/4ii powering most trains until they were replaced by ABe8/12 units around 2010.
