Liddell faced the problem of bridging two key natural geographic barriers to connect with the Taff Vale Railway at Quakers Yard, the Ebbw Valley and the Rhymney Valley.
In January 2013 Kohn announced that he was eligible to play for Wales as his grandfather was from the Rhymney Valley.
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Finally the line circumvented the town of Caerphilly, and crossed the Rhymney Valley by means of the Llanbradach Viaduct, near Pwllypant, constructed to ease the gradient onto the BMR at Maesycwmmer.