The four dams in the Elan Valley were built to supply water to Birmingham, and were authorized by an Act of Parliament in June 1891.
At its maximum extent, the railway had 33 miles (53 km) of track supporting the construction work, running from a junction with the Cambrian Railways Mid Wales line near Rhayader to, at the furthest point, the Craig Goch dam site.
The dams were officially opened by King Edward VII on 21 July 1904, although construction continued until 1906.
The majority of the EVR was lifted by 1912, with the final main line track being removed in 1916.
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