This was followed by the opening of a second branch line in 1863 – the Conwy Valley Line – which headed south and was built by the Conway and Llanrwst Railway, and became part of the LNWR in 1867. It follows the valley of the River Conwy to Llanrwst (where it originally terminated) and Betws-y-Coed (a later terminus in 1869), then follows the Lledr Valley and a two mile long tunnel to terminate at Blaenau Ffestiniog, where passengers can join the Ffestiniog Railway.