Colas Rail is a leading provider of railway infrastructure services – providing design, engineering, project management, construction and maintenance solutions for the light rail, metro, mainline and high-speed markets.

We specialise in delivering complex rail infrastructure projects in collaboration with our customers, stakeholders and our supply chain partners. Our dedicated teams possess a deep understanding of the railway, helping us to develop safe and efficient solutions that consider the needs of the passenger during design, construction and throughout the life of the new infrastructure.

Our experience affords us the ability to advise and support our customers in developing cost-effective practical solutions to keep the railway moving.

Track Installation and Renewal

We are a leader in the installation, renewal and maintenance of track work for light rail, metro, mainline and high-speed environments. Meticulous planning, strong leadership and site management, combined with continuous investment, has enabled us to become one of the UK’s largest track contractors.


We offer all construction services and management associated with OHLE Systems, both mechanical and electrical, including piling, steel erection, SPS installation and modification, dewirements, new wire run installation, OHLE switches and switch feeds, in-span equipment and 25KV auto transformer cable and associated civils works.

Throughout the life cycle of a project – from conception, through to design, detailed design, construction, and testing and commissioning – we also offer OHLE Surveys including, height and staggers, asset condition survey, high level surveys and ground investigations, testing and commissioning, entry into service, and isolation planning and delivery.

Signalling & Telecoms

Our team delivers complex design, construction, and testing and commissioning of signalling and telecoms works – including interlocking renewals, re-control of lineside assets, new and relocated signals, location cases, point operating equipment, full and partial level crossing renewal, signal box refurbishment or renewal, together with all associated supporting disciplines.

Design and Survey

We deliver tailored survey and design solutions to our clients for plain line and S&C track, track drainage, overhead line electrification and signalling schemes, including design management and coordination for multi-disciplinary enhancement and renewals.



In 2019, Colas Rail UK won a 10-year contract for the South Rail Systems Alliance (SRSA) across three Network Rail regions in the South of the UK –
Western & Wales, Southern and Anglia.

The SRSA is a £2 billion framework that spans CP6 and CP7 – creating an alliance between Network Rail, Colas Rail Ltd (installer) and AECOM (designer) and providing an integrated delivery model principally for the development, design and construction of track renewals for both plain line, switches and crossings.

In addition, the Alliance undertakes associated survey, site investigations, drainage, traction power, signalling (alterations and enhancement e.g. interlocking changes, signal moves, signalling power alterations), electrification (alterations and enhancements), platform works (coper alignment and platform extensions).