For hikers the south entrance to the Aberglaslyn Pass is found on the A4085 in Nantmor where there is a pay-and-display parking lot. From that location a trail leads north through the pass following the river where you see the man walking on the right. Look further and you can see four people on the trail. Above the people, and just below the dark branch, a light grey fence marks the location of the railway right-of-way.