Project Profile: South Wales Metro Transformation

The South Wales Metro project is a transformative infrastructure initiative designed to overhaul the region’s rail network. It involves the extensive electrification and modernisation of the Core Valley Lines, introducing a high-frequency, integrated transport system that combines heavy rail, light rail, and bus services to improve connectivity across Southeast Wales.

Technical Specifications

The core of the project is the upgrade of 172 km of the Core Valley Lines radiating from Cardiff. A key engineering feat is the electrification of these lines using 25kV AC Overhead Line Equipment (OLE), enabling the deployment of a new, faster, and more environmentally friendly fleet. The signalling infrastructure is being modernised to a state-of-the-art system to facilitate increased service frequency, with a target of at least four services per hour from the valley heads.

The rolling stock procured for the Metro is a strategic mix of advanced train types. This includes 36 Stadler CITYLINK Class 398 tram-trains, capable of operating on both heavy rail lines and future on-street light rail extensions. For longer-distance routes, 35 Stadler FLIRT Class 756 tri-mode (electric, diesel, battery) trains have been introduced, providing operational flexibility across the partially electrified network. These fleets are maintained at a purpose-built £100 million depot and control centre at Taff’s Well, which serves as the operational heart of the new network.

Key Takeaways

• Frequency and Capacity Transformation: The project fundamentally shifts the network from a traditional commuter railway to a high-frequency metro system, aiming for “turn-up-and-go” services that significantly reduce wait times and increase passenger capacity.
• Economic Regeneration Catalyst: By drastically improving transport links between the valleys and the capital city of Cardiff, the Metro is designed to stimulate economic growth, improve access to employment, and support regional development.
• Sustainable Multimodal Integration: The introduction of electric and battery-hybrid rolling stock, combined with plans for integrated ticketing with bus services, marks a major step towards creating a sustainable, seamless public transport network for South Wales.

Frequently Asked Questions (FAQ)

When will the South Wales Metro be fully open?
The South Wales Metro is being introduced in phases. While many new services and trains became operational during 2024 and 2025, the full integrated network, including final frequency enhancements and ticketing systems, is expected to be fully completed and operational during 2026.

Who is building the South Wales Metro?
The project is being delivered by Transport for Wales (TfW). The primary infrastructure and operations partner is KeolisAmey, with major contracts for construction and technology awarded to specialists including Balfour Beatty for electrification, Siemens Mobility for signalling, and Alun Griffiths for civil engineering works.