What is the coolest tube line?

The Waterloo & City and the Jubilee were the coolest lines, while the Metropolitan and Hammersmith & City attracted fewest complaints. TfL said air-conditioned trains were in use on 40 per cent of the Underground network. New trains due to be introduced on the Piccadilly line from 2025 will also have air conditioning.



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As those passengers using the stretch between Tooting Bec and Stockwell may have guessed, the Northern line is London's busiest tube line, with 294m journeys made on it during the past year. It runs through both Waterloo and King's Cross St Pancras tube stations — the two busiest on the network.

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Wear light clothing. Even if you think you might need to wear a jacket, when you are on the hot Tube, it's likely you'll want to take it off immediately. Heavy, dark, thick clothing will make you more likely to sweat, and hold on to the sweat your body does produce – keeping you hot and clammy for longer.

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Source of the heat The heat in the tunnels is largely generated by the trains, with a small amount coming from station equipment and passengers. Around 79% is absorbed by the tunnels' walls, 10% is removed by ventilation, and the other 11% remains in the tunnels.

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Roding Valley is London's least used tube station. Roding Valley is found on the central line.

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T he Jubilee line is Londoners' favourite on the Underground, according to a new survey of passengers. One in four (24 per cent) of those polled named it as their favourite line just ahead of the Victoria line (19 per cent).

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The Metropolitan line is the oldest underground railway in the world. The Metropolitan Railway opened in January 1863 and was an immediate success, though its construction took nearly two years and caused huge disruption in the streets. Read more about the Metropolitan line.

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The Jubilee line is a line on the London Underground. It runs from Stanmore in north-west London to Stratford in east London. The color of the Jubilee line on tube maps is gray.

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With the Bakerloo line trains being the oldest passenger trains in regular operation in the country, there is a strong business case for their replacement. New trains will enable TfL to continue to maintain a reliable service, avoid the increasing cost of maintaining obsolete trains and increase passenger demand.

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