Transport for the South East (TfSE) is highlighting the findings of a refreshed economic study into the Western Rail Link to Heathrow (WRLtH), which TfSE contributed funding towards.

The study from the Thames Valley Chamber of Commerce provides an updated and positive assessment of the scheme, showing that estimated costs are now lower and that overall financial viability has improved. It also confirms that the link would generate strong economic returns under both two‑runway and three‑runway Heathrow scenarios, with the potential for a return on investment by 2044 based on a 2032 opening.

The report sets out several factors strengthening the case for delivery. Surface access traffic at Heathrow has rebounded more quickly than expected, with 2025 levels matching pre‑pandemic forecasts, while a review of capital costs suggests meaningful efficiencies could be secured, particularly for tunnelling.

The study also outlines a potential delivery model combining public and private investment: one option proposes private financing for the tunnel and Terminal 5 connection, alongside Network Rail delivery of the Langley junction. Under a three‑runway scenario, the financial returns are significantly more favourable, with an indicative internal rate of return of 8.1%.

TfSE continues to recognise the importance of the Western Rail Link in supporting better connectivity, sustainable travel and economic growth across the South East. WRLtH is highlighted in TfSE’s Strategic Investment Plan and Rail Strategy as a scheme that would improve access to Heathrow for millions of people, while reducing road congestion and unlocking opportunities for places such as Reading, Didcot, Oxford, Slough and Swindon.

TfSE will keep working with partners to support the next phase of work, including the proposed Phase 2 study to further develop the business case and help inform future government decisions.