Four Lines Modernisation

TFL-4LM (Four Lines Modernisation)

ATCN were commissioned by CH2M Hill to provide lead drainage design services on TFL’s biggest programmes known as the Four Lines Modernisation (4LM). The project estimated at £4.2billion and the biggest in the history of TFL. The project involved transforming the Circle, District, Hammersmith & City and Metropolitan lines, in order to increase capacity and boost reliability to make journeys faster and more comfortable for passengers.

ATCN provided drainage technical expertise for Signalling Equipment Rooms (SERs), which included comprehensive drainage services to TFL covering all aspects of drainage systems to track, stations, depots and operational buildings as well as answering drainage queries at all levels within the organisation and providing answers to external parties as necessary.


    TFL (Transport For London)

  • Project:

    Four Lines Modernisation

  • Project Value:

    £4.2 Billion