Gasworks Tunnel

The Gasworks Tunnel, also historically known as the Maiden Lane Tunnel, is a railway tunnel immediately to the north of King's Cross railway station in London, United Kingdom. It consists of three parallel bores which carry the six tracks of the East Coast Main Line under the Regent's Canal, as well as roads and housing. Each bore is 528 yards (483 m) in length and all the tracks are designed to be used bi-directionally. Each bore was opened separately between 1852 and 1892. In 1977, as part of greater modernisation efforts, the eastern bore was taken out of use and the other two bores were converted to be used bi-directionally. To increase capacity, the eastern bore was reinstated in 2021 as part of a larger upgrade of the station and the entire East Coast Main Line.

Tunnel data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).