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This line runs through a valley which formerly had many coal mines. At Merthyr Tydfil and Dowlais there were a number of ironworks and later steelworks.
The northern portion of this line between Abercynon and Merthyr Tydfil runs alongside the course of much of the Pen-y-darren Tramway.
From Cardiff to Merthyr Tydfil Plymouth Street. Plymouth Street station is now closed and the a small single platform station on the site of the former Great Western Railway station is the Merthyr Tydfil station.