Four Lines Modernisation (4LM)

In the largest project of its kind, Tratos has supplied more than 1,400,000 km of axle counter cable, low voltage signalling power and control cable to Thales GTS for its Transport for London/London Underground Four Lines Modernisation (4LM) programme.
4LM is a project to increase capacity within London Underground and will upgrade the signalling systems of four of the most important railway lines: Circle, District, Hammersmith & City and Metropolitan which between them account for 40 percent of Underground traffic.
Unique features of the project include five complex rail junctions, 113 stations and 191 trains, interfacing the system with four depots and the integration and presentation of existing trains and PA systems with a central control centre.
Aging infrastructure, in parts up to 150 years old, meant this was a challenging task that needed to be delivered quickly and accurately.
Tratos designed a range of fully compliant cables to meet all the requirements.