Hamburg's public transport struggles with uneven air conditioning across buses and trains

Hamburg’s public transport system offers mixed comfort when it comes to air conditioning. Buses and newer trains often provide cooling, but older models and some rail services do not. Passengers may experience varying conditions depending on the vehicle they board. Buses run by Hochbahn, VHH, and other EVN providers usually have air conditioning. However, occasional faults can leave passengers without cooling. Hochbahn’s electric buses and some diesel models use modular rooftop units to maintain temperatures about three degrees lower than outside.

On the rail network, the picture is less consistent. Hamburg’s S-Bahn operates a fleet of older 474-series trains without air conditioning alongside newer 490-series models that include it. The cooling systems on these trains use a significant amount of energy—about one-sixth of the train’s total power. Even if the air conditioning fails, S-Bahn services continue to run, prioritising passenger transport over comfort.

The U-Bahn network also has a split. All 163 newer DT5 trains are equipped with air conditioning. But the 126 older DT4 trains lack the feature and cannot be upgraded. For both buses and trains, keeping temperatures stable is difficult. Frequent door openings and changing weather make consistent cooling a challenge. Air conditioning remains uneven across Hamburg’s transport network. Newer buses and trains generally offer cooling, while older models often do not. The systems, where available, can be energy-intensive and prone to occasional faults.