Designed by Benjamin Outram, it was built out of gritstone with ashlar coping.

[1] Originally considered as an open cutting, it was designed in the style of canal tunnels, so as to not disturb the owners of the nearby Stodhart Lodge.

[2] It ran for about 100 yards (91 m)[3] under the road between Chapel-en-le-Frith and Glossop, as a single track route.

It remained a single-track route when the rest of the tramway was doubled, becoming a bottleneck on the line.

[5] From the 1950s part of the tunnel and about 1⁄2 mi (0.80 km) of track was tar sealed and used to test Ferodo brakes.