London's Public Transport: A Sweltering Summer Nightmare

The suffocating heat on London's public transport during summer has become a recurring problem, with extreme temperatures on trains and buses leading users to seek alternatives.

London summers, a period that is supposed to bring relief, have transformed into a test of endurance for the inhabitants of the British capital. Temperatures, which have sometimes exceeded **40°C**, have turned the Underground and buses into veritable ovens. While Mayor **Sadiq Khan** has promised air conditioning, the reality is that this improvement is currently limited to bus drivers' cabins, leaving passengers at the mercy of reheated air seeping through the few open windows.

## Air Conditioning, a Scarce Luxury

The **London** Underground network, which carries around **four million passengers** daily, only has air conditioning on four of its lines: **District Line**, **Circle Line**, **Hammersmith & City Line**, and **Metropolitan Line**. Although the system's power isn't excessive, it at least allows for minimal fresh air circulation. In contrast, older lines like the **Piccadilly** or **Bakerloo** rely on natural ventilation from windows, a largely ineffective solution when the heat is intense. This situation has led some users to take extreme measures, such as jumping off at the nearest stop before suffering a collapse. British resignation to these inconveniences is palpable, with passengers stoically enduring high temperatures without raising their voices, unlike tourists who observe the scene with bewilderment.

## Escaping the Heat: Transport Alternatives

Faced with the impossibility of traveling comfortably, many Londoners have sought alternatives to escape the heat. **Uber**'s river ferries, known as **Thames Clippers**, saw a passenger increase of over **83%** during the hottest weeks of the summer. These ferries, which normally carry around **10,000 users** daily, became a cool refuge. Similarly, electric bikes from platforms like **Lime** or **Voi** saw demand increase by between **50% and 100%** during the heat peaks in June, July, and August. According to a report by the **London Evening Standard**, almost half of Londoners opted to walk or cycle instead of using public transport, despite the physical effort involved in extreme temperatures and humidity.

## Desertion on Older Lines

The Tube lines most affected by the lack of air conditioning appear to be suffering the consequences. Lines such as the **Piccadilly** (-9%) or **Bakerloo** (-3.3%) have registered notable drops in passenger numbers in **2026**. While there is no statistical data directly linking these declines to high temperatures, experts point to the heat as the primary cause of this passenger "desertion." It stands in stark contrast to an early 20th-century advertising campaign that encouraged Londoners to use the Underground to cool off, when tunnel temperatures hovered around **14°C**. Today, the combination of traffic, overcrowding, and climate change has turned the legendary "tube" into a hellish place.