[2] Per the inscription on the tunnel entrance it was constructed under the chairmanship of William Bower Forwood by the engineer Charles Douglas Fox.

[3] The tunnel portal at Herculaneum Dock is halfway up a cliff so that the track seamlessly run onto the elevated section of Overhead Railway.

[citation needed] The inscription “LOR Southern Extension” lies above the portal.

[1] In April 2020 the private owner of the tunnel was looking to sell it with suggestions it could be used as a wine cellar.

[4] Media related to Dingle extension tunnel at Wikimedia Commons