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Severn Tunnel

The Severn Tunnel is a railway tunnel in the United Kingdom, linking South Gloucestershire in the west of England to Monmouthshire in south Wales under the estuary of the River Severn. Wikipedia
Construction started: 1872
Opened: 1886
Engineer: John Hawkshaw
Contractor: Thomas A. Walker
Length: 7,008 m (4.355 mi)
Location: River Severn