Four Lines Modernisation (4LM)

Project name: Four Lines Modernisation (4LM)

Location: London, United Kingdom

Company/client: Transport for London / London Underground – Principal contractor – Thales GTS

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 required electrical, physical and fire safety code of practice demands without compromising the safety critical signalling and control systems. Its LSZH compounds, which were used for the insulation and outer sheath, had to comply with LU S1085 A4 (Fire safety materials code of practice) and the operational cable service life of 40 years.

To deliver the benefits as early as possible, the network has been divided into 14 ‘Migration Areas’ for a carefully phased rollout. The first five of these are centred on the Circle line and improvements will go live at the end of 2019, bringing faster, more frequent trains to the travelling public years ahead of the completion date.

Related Families

Related Products

Similar Case Studies

Our website uses cookies and thereby collects information about your visit to improve our website (by analyzing), show you Social Media content and relevant advertisements. Please see our cookies page for further details or agree by clicking the 'Accept' button.

Cookie settings

Below you can choose which kind of cookies you allow on this website. Click on the "Save cookie settings" button to apply your choice.

FunctionalOur website uses functional cookies. These cookies are necessary to let our website work.

AnalyticalOur website uses analytical cookies to make it possible to analyze our website and optimize for the purpose of a.o. the usability.

Social mediaOur website places social media cookies to show you 3rd party content like YouTube and FaceBook. These cookies may track your personal data.

AdvertisingOur website places advertising cookies to show you 3rd party advertisements based on your interests. These cookies may track your personal data.

OtherOur website places 3rd party cookies from other 3rd party services which aren't Analytical, Social media or Advertising.