IIRailway Tunnel Portal At the S entrance of Blaenau railway tunnel, immediately W of the road on the downhill approach to the town from the Crimea Pass.
IITorpantau tunnel - E portal On the mountainside within a forestry plantation almost due W of Pont Blaen-y-glyn and below the summit of Coetgae-llwyn.
IITorpantau tunnel - W portal By the mountain road near Taf Fechan Forest, N of Pentwyn reservoir and in an area of open mountain called Coetgae-llwyn.