St John's Wood substation from the air
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aerial photograph of St John's Wood substation, London England UK. St John's Wood substation is connected to Elstree by "The London Connection" , a 20km cable tunnel which has its own monorial system. The London Connection was the National Grid’s largest ever tunnelling project and is 3m wide , 20m underground and carries 400kv cables.St John's Wood substation is the grid supply point (GSP) for Kensington & Chelsea and Westminster.
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