As the United Kingdom grapples with record-breaking June temperatures approaching 40C, transport operators are advising the public to reconsider non-essential journeys. The Met Office has cautioned of "severe and significant impacts," including health risks and widespread disruption to transportation networks. While some individuals will work or study from home, many will still need to travel.
Rail travel is expected to be among the most affected. Steel tracks expand in high temperatures, leading to the risk of buckling, and overhead electric wires can sag, prompting Network Rail to implement speed restrictions on numerous routes. This measure will result in longer journey times and reduced service frequency. Several operators serving London, including Avanti West Coast, c2c, Chiltern Railways, East Midlands Railway, Great Western Railway, London Northwestern Railway, LNER, South Western Railway, Southern, Heathrow Express, and Gatwick Express, have already announced modified timetables, cancellations, or travel easements.
Passengers are advised to check operator websites for specific journey updates, as some are allowing ticket usage on alternative services or different dates at no extra cost. Phil James, Network Rail's North West route director, stated that slower speeds may be necessary for safety, which could extend journey times. Travelers by train should anticipate delays, crowded services, and longer waits, particularly in the afternoon when temperatures peak.
For London Underground users, the experience will vary. Transport for London (TfL) operates 192 air-conditioned trains on nearly 40 percent of its network, covering the Circle, District, Hammersmith & City, Metropolitan, and Elizabeth lines, along with much of the London Overground. However, older deep-level lines, such as the Piccadilly and Bakerloo lines, can become significantly hotter, especially during peak hours. Passengers are advised to utilize air-conditioned lines where possible, carry water, and avoid traveling during the hottest parts of the day.
Buses may offer a less comfortable travel experience. Drivers have reported cab temperatures exceeding 40C, with some buses operating with faulty air conditioning. The Unite union has noted that overheating can increase driver fatigue, posing potential safety concerns. Large windows can create a greenhouse effect, trapping heat, and some buses rely on basic air-cooling systems that provide limited relief. Travelers on buses should expect warm conditions, particularly on crowded services during afternoon peaks.
While driving might seem like an alternative, extreme heat presents its own challenges for motorists. Road surfaces can reach temperatures around 50C, affecting grip and braking performance. The RAC anticipates a surge in breakdowns, potentially a 20% increase compared to a typical June day, due to overheating engines, tyre failures, and battery problems. National Highways recommends that drivers check tyre, coolant, and oil levels before travel and carry water. Motorcyclists and cyclists should also exercise caution due to hot road surfaces affecting handling and increasing dehydration risks.
Commercial air travel, despite a past incident involving an Air India flight in Ahmedabad where temperatures exceeded 38C, is generally considered safe. Experts emphasize that commercial aircraft are designed to operate in much hotter climates. However, extreme temperatures can impact performance. Warm air is less dense, potentially requiring longer runways for takeoff and leading to delays or operational restrictions. With Heathrow forecast to reach around 35C, passengers are advised to check flight updates and allow extra time at the airport. Flying is generally regarded as one of the safest forms of transport during a heatwave.