Werrington dive-under

The Werrington dive-under (known as the Werrington Grade Separation during construction) is a replacement dual track grade separated railway junction at Werrington Junction, 3 miles (5 km) north of Peterborough railway station in Cambridgeshire, England. The junction leads to the Great Northern/Great Eastern Joint line (GN/GE) which goes through Spalding to Lincoln and beyond. Completed and opened in December 2021, the dive under allows trains on the west side of the East Coast Main Line (ECML) to access the GN/GE line without conflicting with the faster passenger services on the ECML.

The dive under was constructed by a 'jacked deck' on slide paths installed in access tunnels. The curved 'jack deck', pushed into place beneath the main running lines, will be the first use of such a structure in the United Kingdom. The installation uses a patented method of construction.

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