Daylighting (tunnels)

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Daylighting a tunnel is to remove its "roof" or overlying rock and soil, thus exposing the railway or roadway to daylight. This could also be seen as converting the tunnel to a railway or roadway cut. Tunnels are often daylighted to improve vertical or horizontal clearances, for example to accommodate double-stack container trains or electrifying rail lines, where increasing the size of the tunnel bore would be impractical.

List of daylighted tunnels[edit]

  • United Kingdom
    • Lime Street Station in Liverpool was originally approached through a 1.13-mile (1.82 km) twin-track tunnel completed in 1836. The tunnel was daylighted in the 1880s, and replaced with a deep four-track cutting, with only the eastern 50 metres (55 yd) approaching Edge Hill railway station remaining as a tunnel.
The short remaining portion of Liverpool's Lime Street Station tunnel can be seen west of Edge Hill Station.

References[edit]

  1. ^ F. C. Weeks et al., "Tunnel 'Daylighting' on the Alaska Railroad," Transportation Research Record No. 1119, Geotechnology (1987).

See also[edit]