Key Points
- The £1.5bn Core Valley Lines Transformation project within the South Wales Metro has received the prestigious Sir John Armitt Prize in the British Construction & Infrastructure Awards 2026.
- This award was presented at the 39th annual British Construction & Infrastructure Awards Gala Dinner, which was organized at Grosvenor House Hotel in Central London on 14 October 2026.
- Transport for Wales is the client and commissioning body while Amey Infrastructure Wales is the lead contractor and lead engineer of the project.
- The other organizations that have been connected with the project include Craidd Alliance, Balfour Beatty, Siemens Mobility and Rail.
- Sir John Armitt Prize is awarded to projects which have not only exceeded their targets but have also made positive contributions to their clients and passengers alike.
- The transformation project of Core Valley Lines includes electrification, new track, station upgrades, signal upgrade and trains in South Wales.
- In addition, the same project has received the award of ‘Transport Project’ for the electrification of the Core Valley Lines.
- More than 900 industry leaders have been present in the ceremony in London.
Wales (Wales Times) October 16, 2026 — The £1.5bn transformation of the Core Valley Lines has won the Sir John Armitt Prize, described as the UK’s top infrastructure award, at the British Construction & Infrastructure Awards 2026.
As reported by Herald Wales, the Core Valley Lines transformation received the Sir John Armitt Prize at the British Construction & Infrastructure Awards. The award recognises a major rail modernisation programme that forms a central part of the wider South Wales Metro.
The prize was announced at the 39th British Construction & Infrastructure Awards, held at the Grosvenor House Hotel in central London on 14 October 2026. According to New Civil Engineer, more than 900 industry leaders attended the ceremony, where winners across construction and infrastructure were revealed.
The winning project is listed as “South Wales Metro – Building the Core Valley Lines Transformation.” Transport for Wales is named as the client and commissioning authority, while Amey Infrastructure Wales is identified as both lead contractor and lead engineer.
Why Did the Core Valley Lines Win?
The Sir John Armitt Prize is awarded to projects that successfully exceed their objectives, deliver a satisfied client and create meaningful benefits for end-users and broader stakeholders. The British Construction & Infrastructure Awards describe the prize as recognising “excellence across multiple aspects” of a project and as an example for the wider industry.
As reported by New Civil Engineer, the Core Valley Lines transformation was selected for the Sir John Armitt Prize, while the electrification of the Core Valley Lines, delivered by Amey, received the Transport Project Award.
The project was shortlisted alongside other major schemes for an award endorsed by Sir John Armitt. The shortlist information published by the British Construction & Infrastructure Awards states that the Core Valley Lines project involved Amey Infrastructure Wales, the Craidd Alliance, Balfour Beatty and Siemens Mobility & Rail.
What Does the Core Valley Lines Transformation Involve?
The Core Valley Lines transformation is a £1.5bn programme intended to modernise rail connections between Cardiff and the South Wales Valleys. It forms part of the wider South Wales Metro, which aims to create a more integrated transport network across the region.
According to the Association for Project Management, the programme involves electrifying 170km of the Core Valley Lines, laying 180km of new track and converting several former single-track routes into double track. The same source says the programme includes upgrades to 52 existing stations and the construction of two new stations.
Balfour Beatty has previously described the project as involving the electrification and conversion of more than 172km of track and 52 stations across South Wales. The company said the work is being delivered through the Craidd Alliance, which it described as the first rail alliance in the world to secure international accreditation for collaboration.
Transport for Wales says the Core Valley Lines will become an important part of the South Wales Metro. Its project information describes the lines as central to improving travel across the Cardiff Capital Region.
Who Delivered the Award-Winning Project?
Transport for Wales commissioned the Core Valley Lines transformation as part of the South Wales Metro programme. Amey Infrastructure Wales acted as lead contractor and lead engineer on the award-winning scheme.
The project also drew on the expertise of several major delivery partners. The British Construction & Infrastructure Awards shortlist identifies the Craidd Alliance, Balfour Beatty and Siemens Mobility & Rail among the key firms associated with the work.
Amey had previously highlighted the project’s recognition at the Association for Project Management Awards, where the Core Valley Lines Transformation Programme was named Transformation Project of the Year and Overall Project of the Year in 2024. The company said the work would benefit communities across South Wales for years to come.
How Significant Is the Award?
The Sir John Armitt Prize returned for its second year in 2026. According to the British Construction & Infrastructure Awards, it is intended to recognise an exceptional project that surpasses its objectives and delivers significant benefits to passengers, clients and wider stakeholders.
The award places the South Wales Metro’s Core Valley Lines transformation among the UK’s most recognised infrastructure schemes of the year. It also follows earlier recognition for the programme, including the Association for Project Management’s 2024 Overall Project of the Year Award.
The Transport Project Award separately recognised the electrification of the Core Valley Lines. New Civil Engineer listed Amey as the recipient for that category, reflecting the role of electrification within the broader transformation programme.
What Happens Next on the South Wales Metro?
The award comes while work on the wider South Wales Metro continues. The Institution of Civil Engineers has previously reported that infrastructure works on the Rhymney and Cardiff Bay lines were due to continue until the end of 2026.
The Core Valley Lines programme has already delivered new trains and faster services on parts of the network. The Association for Project Management reported in 2024 that passengers were already benefiting from improvements on three lines, while remaining works were expected to be completed by the end of that year.
Transport for Wales continues to describe the Core Valley Lines as a key element of the South Wales Metro. The project’s long-term purpose is to improve connectivity, capacity and reliability for communities across South Wales.
Background of the Development
The Core Valley Lines are the rail routes linking Cardiff with communities in the South Wales Valleys, including the Taff, Rhymney, Ebbw and Sirhowy corridors. The lines had historically suffered from limited capacity, ageing infrastructure and constrained services, prompting a major modernisation programme under Transport for Wales.
The transformation forms part of the South Wales Metro, a wider plan to improve public transport across the Cardiff Capital Region through better integration of rail, bus and active travel. The Core Valley Lines programme includes electrification, track upgrades, station improvements, signalling work and the introduction of new trains.
The programme has previously received national recognition. In 2024, the Association for Project Management named the Core Valley Lines Transformation Programme both Transformation Project of the Year and Overall Project of the Year, citing its scale, delivery approach and potential to improve living standards in the valleys.
The latest Sir John Armitt Prize adds to that record. It recognises the project’s delivery outcomes and the benefits created for passengers, communities and stakeholders across South Wales.
Prediction: How Will This Affect South Wales Passengers?
For passengers in Cardiff and the South Wales Valleys, the award is likely to reinforce confidence in the ongoing South Wales Metro programme. The recognition highlights that the Core Valley Lines transformation is being viewed across the UK infrastructure sector as a project delivering practical transport benefits.
As electrification, track improvements and station upgrades continue to take effect, passengers may experience more frequent, faster and more reliable services between the valleys and Cardiff. The programme’s new trains and improved infrastructure are intended to support daily commuting, education, healthcare, leisure travel and access to employment.
For local communities, the development may also support wider economic activity by improving connections between the valleys and Cardiff. Better transport links can make it easier for residents to reach jobs, services and opportunities across the region, while supporting the long-term growth of the Cardiff Capital Region.
For the construction and rail sector, the award may encourage further investment and collaboration on comparable transport modernisation schemes. For Transport for Wales, Amey and their delivery partners, the recognition strengthens the project’s profile as a major example of rail transformation in the UK.
