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, where increasing the size of the tunnel bore would be impractical.
List of Daylighted Tunnels
- United States of America
- Auburn Tunnel on the Schuylkill Canal, daylighted in 1857
- Tunnel No. 5 on the Alaska Railroad's Seward-Anchorage line[1]
- Tunnel No. 5 on the Virginia & Truckee Railroad at Nevada S.R. 341 near Virginia City
References
- ^ F. C. Weeks et al., "Tunnel 'Daylighting' on the Alaska Railroad," Transportation Research Record No. 1119, Geotechnology (1987).
See also
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