Heading seawards (northwards) from the quarry at Bethesda the first (Cilgeraint) incline was bypassed by building an almost parallel straight line at a gentler end-to-end gradient whose foot was some distance north of the foot of the incline. A similar approach was not feasible for the other two inclines, so the traditional approach was taken – to increase the length of the line to spread the grade. The old route was retained to the head of the Dinas Incline where the new line swung through 180 degrees in a horseshoe bend, thereby changing from heading northeast to southwest. It then swung past a new halt at Tregarth before swinging northwards again past a new halt at Felin Hen, whereafter the line headed more or less straight for Port Penrhyn, meeting the original alignment below the foot of the Marchogion Incline.