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1946 map showing the route of the tunnel. The Severn Tunnel (Welsh: Twnnel Hafren) 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.
Map showing the Severn road and rail crossings, the Severn Bridge (top right), Severn Tunnel and Prince of Wales Bridge (Second Severn Crossing) (bottom left) Aerial view of both Severn bridges. The older Severn Bridge is in the foreground and the newer Prince of Wales Bridge in the background.
Severn Tunnel Junction railway station (Welsh: Cyffordd Twnnel Hafren) is a minor station on the western side of the Severn Tunnel in the village of Rogiet, Monmouthshire, Wales. It is 123.5 miles (198.8 km) from London Paddington and lies at the junction of the South Wales Main Line from London and the Gloucester to Newport Line .
Motorway crossings over the River Severn Prince of Wales Bridge (M4 motorway) Severn Bridge (M48 motorway) Queenhill Viaduct (M50 motorway) This is a list of crossings of the River Severn in Great Britain (including bridges, tunnels, ferries and fords), in order from source to mouth. The Severn has historically been a very important and busy river, and has been bridged throughout history. The ...
One of four tunnels on the Cambrian Coast Railway. 1867 Gwynedd: Ffestiniog Tunnel: Railway: 3,407: 3726: UK's longest single-track tunnel, in use on the Conwy Valley Line: 1879 Monmouthshire & Gloucestershire: Severn Tunnel: Railway: 7,012: 7668: Longest mainline tunnel in the UK until 2007 when tunnels on High Speed 1 opened: 1886 ...
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However, a length of 0.63 miles (1.01 km) near the middle of the tunnel and 0.28 miles (0.45 km) at the Daneway end are cut through fuller's earth, and although lined with brick, the fuller's earth expands when wet, and this has resulted in heave of the bottom of the tunnel, causing wall and roof falls.
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