Abstract
London is a megacity with a population of just under 10 million people that is increasing. Investment in major infrastructure projects is required to cope with this growth, including the upgrade of existing rail infrastructure. The West Anglia main line project in north London involves upgrading the railway network to meet the demands spawned by the regeneration of the Lea Valley hinterland, catalysed by the redevelopment of the Elizabeth Park (former site of the London 2012 Olympics). The works included upgrade of Tottenham Hale and Northumberland Park stations, and construction of a brand new Meridian Water station and other lineside infrastructure. The project will increase rail capacity, provide better internal mobility and improved links to the city on this congested West Anglia main line, as well as accommodate proposed future plans for Crossrail 2 between London and Stansted airport. The project will also unlock housing development and economic growth in the boroughs of Enfield, Haringey and Waltham Forest. This paper presents a geotechnical perspective of the project and discusses the ground conditions, design and construction of the trackbed and substructures for bridges, overhead line equipment and station upgrade works. This will leave a legacy for future designers of upgrade and extension works.
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