 At Afon Wen, a junction connected with the Cambrian Line (GWR) to Pwllheli in one direction and to Porthmadog in the other, with LNWR/LMS running rights to both.The line had two branches, one from Caernarfon to Llanberis, which was built by the Carnarvon and Llanberis Railway and the other from Penygroes to Nantlle, which formed part of the narrow gauge Nantlle Railway, which between Penygroes and Caernarvon had been incorporated into the Carnarvonshire Railway.Regular passenger service on the Llanberis branch ceased in the 1930 (but summer passenger excursions from Llandudno etc.