Sugar Loaf Tunnel

The tunnel is 132 yards (121 m) long and was built through magnesian limestone of Permian age, referred to locally as "chalk".

The bore has been cleared of rubble but quarrying is threatening the eastern portal and chalk has now encroached to within twenty yards of the tunnel.

The tunnel is in very poor condition although access remains at both ends.

There is also a Sugar Loaf Tunnel on the Heart of Wales/Central Wales line near Sugar Loaf railway station, this is 1,001-yard (915 m) long and remains in use.

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