The Conwy Valley line was constructed by the London and North Western Railway with the primary aim of transporting dressed slate from the Blaenau Ffestiniog quarries to a specially built quay at Deganwy for export by sea. The original plans envisaged a railhead at Betws-y-Coed and a large goods yard was established with intended interchange to a proposed narrow gauge line (with a significant saving in construction costs) via the steeply graded Lledr Valley to Blaenau Ffestiniog. Other entrepreneurs proposed narrow gauge lines from Corwen to Betws-y-Coed, Penmachno to Betws-y-Coed and from Beddgelert to Betws-y-Coed. In the event the line to Blaenau, which was not completed until 1879, was built to standard gauge and the other proposals were abandoned.