 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.In late 2008 the Bryn-y-felin road bridge was rebuilt over the Welsh Highland Railway as part of Gwynedd Council's WHR Bridges policy.