In the Aberglaslyn Pass the trackbed of the Welsh Highland Railway, now being reconstructed, can be seen on the opposite side of the Afon Glaslyn. At its west end, the route crosses the new A487 Porthmadog Bypass at a roundabout west of Tremadog.
The Welsh Highland Railway's trackbed can be seen on the other side of Afon Glaslyn in the Aberglaslyn Pass. The railway crosses the new A487 Porthmadog Bypass at a roundabout near Tremadog.