South Rail Systems Alliance: driving efficiency for Network Rail

Filter projects by:


  • Cities

    Cities EMIA

  • Commercial & Residential

    Mixed Use




  • Education

    Colleges & Universities


  • Energy

    Carbon capture, utilization and storage


    Grid modernization



    Microgrids and energy storage

    Offshore wind

    Portfolio Decarbonization and Climate Resilience


    Transportation decarbonization

  • Healthcare

    Clinical Hospital

    Life Sciences

    Senior Living

  • Industrial

    Agriculture, Food & Beverage

    Automotive & Heavy Equipment & Machinery

    Digital Infrastructure

    High Performance Logistics


    Mining & Metals

    Pharmaceutical/Specialty Chemicals

    Pulp & Paper

  • Justice

  • Leisure

    Arts and Culture

    Hotels and Resorts

    Themed Entertainment and Mixed-Use

  • National Governments

    Civil Works

    Disaster Resilience


    Infrastructure & Facilities

    International Development

  • Oil, Gas & Chemicals





  • Sports and Venues


    Convention Centers

    Olympics & Mega-Events

    Stadiums & Arenas

  • Transportation

    Air Cargo



    Connected and Autonomous Vehicles

    Freight Rail

    Highways & Roads

    Mass Transit

    Ports & Marine

    Transportation decarbonization


  • Water

    Dams & Hydropower

    Flood and coastal resilience

    Industrial Water

    Tunnels, Conveyance, Collection & Distribution

    Wastewater Treatment & Reuse

    Water Treatment

    Watershed and Ecosystem Management


  • AECOM Capital

  • Alternative Delivery Models

  • Architecture and Design


    Asset Advisory

    Climate Adaptation

    Community Engagement

    Interior Architecture

    Landscape Architecture


    Urban Analytics

    Urban Design

    Urbanism + Planning

  • Asset Management

  • Cities Solutions

  • Construction Management

  • Converged Resilience

  • Cost Management

  • Digital Infrastructure Services

  • Economics

  • Electric Vertical Takeoff and Landing Solutions

  • Engineering

    Ground Engineering

  • Environmental Services

    Air Quality Consulting and Engineering

    Climate Adaptation

    EHS Management Consulting and Compliance

    Environmental and Social Impact Assessment and Permitting

    Environmental Contracting

    Management Information Systems (MIS)

    Remediation, Restoration and Redevelopment

  • Fabrication

  • Finance

  • Industrial and Commercial Operations and Maintenance

  • International Development

  • IT and Cybersecurity

  • Mobilitics

  • Multinational Investment and Development

  • Pedestrian Modelling (North America)

  • Planning and Consulting

    Geospatial Services

    Pedestrian Modelling

  • Process Development & Implementation

  • Program Management

  • Public-Private Partnerships

  • Risk Management & Resilience

    Critical Infrastructure Protection

  • Simulation Models

    Rail Simulations

  • Strategic consulting

    People + Place Advisory

  • Tunnels, Trenchless Technology and Underground Infrastructure

  • Vertical Transportation Services (North America)

  • Visualization and Virtual Reality


  • Africa

  • Algeria

  • Antarctica

  • Australia

  • Azerbaijan

  • Bahrain

  • Bangladesh

  • Belgium

  • Bolivia

  • Bosnia and Herzegovina

  • Brazil

  • British West Indies

  • Canada

  • Caribbean-Puerto Rico

  • China

  • Colombia

  • Croatia

  • Czech Republic

  • Egypt

  • Eritrea

  • Finland

  • France

  • Germany

  • Greece

  • Greenland

  • Haiti

  • Hong Kong

  • India

  • Indonesia

  • Iraq

  • Ireland

  • Italy

  • Japan

  • Kenya

  • Kingdom of Saudi Arabia

  • Kuwait

  • Liberia

  • Lithuania

  • Malaysia

  • Maldives

  • Mali

  • Malta

  • Mauritania

  • Mexico

  • Monaco

  • Mongolia

  • Montenegro

  • Myanmar

  • Netherlands

  • New Zealand | Aotearoa

  • Norway

  • Oman

  • Panama

  • Papua New Guinea

  • Peru

  • Philippines

  • Poland

  • Portugal

  • Qatar

  • Romania

  • Singapore

  • Slovakia

  • South Africa

  • South Korea

  • Spain

  • Sri Lanka

  • Sweden

  • Switzerland

  • Taiwan

  • Turkey

  • Ukraine

  • United Arab Emirates

  • United Kingdom

  • United States

  • Vietnam

  • Worldwide

The South Rail Systems Alliance (SRSA) is helping deliver track and rail systems renewals more efficiently through its coordinated, one-team approach. 

Amid the current financial climate, the UK rail industry is facing an unprecedented challenge: how to build and maintain a network that is resilient, safe, and sustainable in the most cost-effective way possible.   

As government funding for rail projects competes with other budget priorities, Network Rail (NR) is having to demonstrate that public funds are being well invested — which is why improving efficiency is crucial for its success.   

Formed in 2019 between AECOM, Colas and NR, the SRSA is a 10-year framework that harnesses the benefits of collaboration to drive efficiency and tackle these sector challenges head on.    

A collaborative approach to project delivery   

The SRSA is one of three alliances appointed by NR to deliver their £5 billion programme of track and rail systems renewals across three UK regions. This collaboration between AECOM, NR and Colas is helping optimise time and cost efficiencies across the South of the UK.    

One positive outcome of the alliancing model is better coordination across teams, which means we can resolve challenges — including emergencies and unforeseen circumstances — faster and more effectively.    

With five emergency derailment works occurring in Year 3 at London Gateway, Whittlesea, Hoo Junction, Eastleigh and Salisbury, our teams rapidly mobilised to complete the emergency works. By working together to limit disruption, we reduced both cost and inconvenience for customers. 

Another way we’re improving efficiency is through progressive assurance (PA) techniques. PA brings designers, assurers and builders together for monthly reviews so that any issues or risks that emerge during the design process can be identified and managed from the outset — rather than further down the line.  

This ultimately leads to more cost-effective design solutions as it facilitates communication between all parties before the designs are realised. 

The benefits of a long-term alliance    

Longevity is a key advantage of the 10-year contract. As well as encouraging consistency, a long-term framework helps nurture stronger working relationships and drive continuous improvement via regular reviews.    

Thanks to those relationships, we are now involved in Governance for Railway Investment Projects (GRIP) stages 1-3, whereas previously we only worked on Stages 4-8.   

Through this earlier involvement, we have an overview of the entire project lifecycle, which eliminates transfer and handover issues and enables deeper engagement with the work as a result. 

To consistently improve efficiency, the SRSA’s benefits are quantified through an efficiency tracker. Using this digital tool, we can monitor efficiency savings and identify where targets weren’t met to enhance forward planning and continue delivering better value for money.

By working collaboratively, AECOM, with the other SRSA partners, is delivering vital services to improve the rail network across the South of the UK, enabling Network Rail to meet our number one priority of putting passengers first.

Richard Ballantine

Head of Finance and Commercial – South Rail Systems Alliance, Network Rail

Why collaboration and efficiency go hand in hand   

By working purposefully together, the SRSA serves as a strong example of how collaboration is driving efficiency in the rail sector. In our fourth and busiest year yet, we successfully delivered £301 million of work – the highest volume of three track renewal alliances in Great Britain.   

By adopting an alliance approach, we’re delivering vital services more effectively, limiting disruption and aligning with NR’s core objective of putting passengers first.