TfW Electrifies Welsh Metro: 25km Line Opens, Tri-Mode Trains Deployed

Transport for Wales (TfW) has electrified a significant 25km stretch of the South Wales Metro network between Caerphilly and Rhymney, marking a pivotal advancement in the region’s rail modernization. This strategic electrification paves the way for the introduction of tri-mode trains, effectively phasing out the remaining diesel rolling stock and enhancing service capabilities.

The electrification of the upper Rhymney line is a major milestone for the South Wales Metro project, enabling TfW to deploy advanced tri-mode trains. These versatile trains, capable of operating on electric, diesel, and battery power, will replace the final legacy diesel rolling stock currently in service, promising a more sustainable and efficient passenger experience. The final section along the Cardiff Bay line is slated for electrification in early 2026, completing this phase of the network’s transformation.

Strategic Impact

The completion of engineering work on the 25km stretch from Caerphilly to Rhymney represents a substantial leap forward in TfW’s commitment to decarbonizing its operations and improving passenger services. The introduction of tri-mode trains signifies a significant upgrade to the fleet, offering greater flexibility and reduced environmental impact. This development is crucial for enhancing the reliability and capacity of the South Wales Metro, a project vital for the economic and social connectivity of the region.

Operational Details

Dan Tipper, Chief Infrastructure Officer at TfW, highlighted the intensive eight-month effort by infrastructure teams. The project involved the installation of 903 steel structures supporting over 33km of overhead wires and the laying of 30km of high-voltage cable. Tipper expressed gratitude to the teams for their round-the-clock dedication and acknowledged the patience of local communities during the disruptive work, which included railway closures over the Easter and Summer holidays. TfW also reiterated a strong warning against railway trespassing, emphasizing the extreme danger posed by the 25,000-volt electrified lines and the increased risk of electrocution.

Industry Context

This successful electrification project in South Wales is indicative of the broader trend across the global railway industry towards greater electrification and the adoption of advanced rolling stock technologies. For railway operators and infrastructure providers, such advancements are key to meeting stringent environmental targets, improving operational efficiency, and delivering a superior passenger experience. The strategic deployment of tri-mode trains, as seen with TfW, represents a pragmatic approach to modernizing existing networks, offering a pathway to full electrification while managing transitional challenges. Furthermore, the proactive safety campaigns and measures against cable theft underscore the industry-wide focus on operational integrity and public safety in an increasingly connected and electrified rail landscape.

Safety and Security Initiatives

TfW is actively engaged in public safety initiatives, particularly through its “No Second Chances” campaign, which aims to educate young people across the Valleys about the perils of railway trespass. By the end of 2025, over 42,000 students are expected to have received railway safety sessions delivered by TfW’s education provider, Bollo. In parallel, TfW is addressing a recent surge in cable theft attempts along the Rhymney line. Enhanced security patrols are now in place, and the public is urged to report any suspicious activity or trespassing attempts to British Transport Police via 0800 40 50 40 or text 61016, with emergency calls to 999.