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The Elstree to St. John's Wood Cable Tunnel, known as The London Connection during construction, is a 20 km long, 3m wide tunnel beneath northwest London.Constructed between 2001 and 2005, the tunnel carries high voltage transmission lines from Elstree substation in Hertfordshire to Lodge Road sub station in Westminster at a depth of 20m below street level.
St. John’s Wood Greater London Kensal Green Underground, along Regent’s Canal and Grand Union Canal 275 kV, 132 kV, 66 kV, 22 kV City Road Underground along Regent’s Canal Hackney London Power Tunnel, single circuit Elstree Elstree to St. John’s Wood Deep Cable Tunnel: Sandford North Somerset Under construction (2020) Seabank Bristol
The 3–4 m diameter tunnels were dug by tunnel boring machines and run 20–60 m below street level. [4] The tunnels were constructed by a joint venture between Costain Group and Skanska. [5] This phase linked Wimbledon and Hackney to substations at Willesden, St John's Wood, St Pancras, and Islington.
Elstree to St. John's Wood Cable Tunnel: Electricity cables: 19,800: 21,653: 3-metre diameter, forced air cooling, 7 ventilation shafts, carries one 400kV circuit, provision for second circuit, battery powered overhead monorail system for access [28] 2005: Hertfordshire: Hatfield Tunnel: Road: 1,147: 1,531: Cut-and-cover tunnel on the A1(M ...
Elstree to St. John's Wood Cable Tunnel; H. Heathrow Airside Road Tunnel; Heathrow Cargo Tunnel; K. Kingsway tramway subway; L. Lee Tunnel; Limehouse Link tunnel;
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a bridge–tunnel carrying monorail Great Belt Fixed Link: 1997 Denmark Zealand and Funen Great Belt: includes a railway tunnel, bridge–tunnel transition uses natural island Øresund Bridge: 2000 Denmark/Sweden Copenhagen and Malmö: Øresund/Öresund: includes a railway tunnel Shanghai Yangtze River Tunnel and Bridge: 2009 China