At Afon Wen, a junction connected with the Cambrian Line (GWR) to Pwllheli in one direction and to Porthmadog in the other, with the LNWR (and later LMS) having running rights to both.
The latter originally formed part of the narrow gauge Nantlle Railway, which between Penygroes and Caernarvon had been incorporated into the Carnarvonshire Railway and converted to standard gauge.
The remaining lines and services (Afon Wen to Caernarvon) were shut completely as part of the Beeching Axe in December 1964.
Some original sections remain and have been used as part of National Cycle Route 8.
The cycle route (Lôn Eifion) and the narrow gauge railway share the old trackbed south of Caernarfon to Dinas.