Ground engineering specialist Mainmark UK has secured a place on the Balfour Beatty plc CP7 Framework, positioning the company to support the delivery of key rail infrastructure works across Network Rail’s latest five-year investment programme.

Control Period 7 (CP7) is the seventh regulatory funding period for Network Rail, running from 1 April 2024 to 31 March 2029, with approximately £43–45 billion allocated across Great Britain. The programme focuses on maintaining, renewing and modernising the rail network to deliver a safer, more reliable and more sustainable railway.

Investment priorities during CP7 include infrastructure maintenance and renewals, digital signalling and technology, safety improvements, and initiatives to improve both freight and passenger performance across the network.

As part of the framework, contractors will deliver a broad range of works aligned with Network Rail’s Strategic Business Plan, including low-complexity emergency callouts, planned preventative maintenance and small-scale civil engineering schemes.

These activities will include geotechnical response works, bridge repairs, structural integrity projects, platform refurbishments and drainage clearance, alongside wider civil engineering tasks such as earthwork renewals, desilting operations and bridge strike response. Building works under the framework will include roof repairs, canopy refurbishments and asbestos removal.

Tom Kavanagh, General Manager at Mainmark UK, said: “We’re looking forward to collaborating with Balfour Beatty to help deliver critical infrastructure works across the network during the CP7 period.

“Being selected to support Balfour Beatty on this framework is a fantastic opportunity for our team and aligns perfectly with our growth plans. It also strengthens our position within the UK rail supply chain.”

Rail infrastructure faces increasing pressure from heavier freight loads, repeated vibration and extreme weather conditions, all of which can contribute to ground instability and subsidence beneath rail lines and surrounding assets.

Heavy rainfall, poor drainage and ground movement can weaken the soil supporting railway infrastructure, leading to voids beneath track structures, platforms and civil assets. This can affect track alignment, restrict line speeds and create operational safety risks.

Beyond the track itself, subsidence can impact railway platforms, stations, depots, train yards, level crossings and bridge structures, making ground stabilisation a critical part of maintaining network resilience.

Mainmark specialises in ground engineering solutions designed to stabilise and re-level infrastructure with minimal disruption to rail operations. The company’s Teretek® resin injection technology can strengthen weak ground conditions and fill subsurface voids without the need for excavation.

The process enables rail infrastructure to be stabilised quickly, allowing large sections of track or platform structures to be treated in stages while keeping rail services operational wherever possible.

The technology is already being used across rail environments to:

By providing rapid, non-invasive ground engineering solutions, Mainmark can support asset owners and contractors in maintaining operational reliability while minimising disruption to passengers and freight services.

With its appointment to the CP7 Framework, Mainmark UK will work alongside Balfour Beatty to help maintain and strengthen critical rail infrastructure across the UK during the current investment period

Mainmark Ground Engineering (UK) Ltd, established in 2016, is a subsidiary of the global Mainmark group. With over three decades of innovation, Mainmark is internationally recognised for solving complex ground engineering challenges. By combining deep industry knowledge with a commitment to sustainability and innovation, Mainmark continues to redefine standards in foundation underpinning and soil stabilisation worldwide.