Heathrow's Third Runway: Train's Future in Doubt?

Heathrow's ambitious £33bn expansion plan, which includes a third runway, is set to increase daily passenger numbers significantly. Alongside logistical challenges like rerouting the M25, a key issue is how to accommodate the surge in travelers and staff sustainably. While rail is seen as a crucial alternative to cars, capacity on existing lines is limited. This has prompted transport experts to question the viability of the Heathrow Express, a service criticized for its high fares (£26 for a 15-21 minute journey) and relatively low ridership, accounting for less than 6% of Heathrow's air passengers last year, including heavily discounted staff tickets.

Transport for London (TfL) believes the Heathrow Express's time may be ending, suggesting its 'valuable paths' could be used for more public transport users. The Elizabeth line is presented as a more compelling alternative, offering a cheaper and more direct route into central London, though current frequencies to Terminal 5 are limited, potentially leading to over an hour-long journey. Plans are underway to double its frequency next year. Other proposed rail schemes, like the Heathrow Southern Railway and Western Rail link, aim to improve national rail connectivity.

The future of the Heathrow Express is further complicated by its operating agreement with the Department for Transport, set to end in June 2028. The service generated £48m in revenue for the first six months of 2026, operating without taxpayer funding and contributing to lower airport charges. However, critics, including the Mayor of London, warn of potential unfunded public transport improvements. Heathrow's own plans to increase car parking capacity raise concerns about encouraging public transport use, especially as previous expansion plans had clearer mandates for shifting passengers to public transport.