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Temporary solution – when temperatures on the, say, Central line between White City and Stratford exceed 30 C: As Per https://en.wikipedia.org/wiki/London_Underground_cooling “Different systems have been proposed to cool Underground trains, including the use of large blocks of ice inside the train. The blocks would be kept in refrigeration units, preventing them from melting completely”
Instead of ice use cheap and readily available sealed picnic “ice packs”. 50kg of these could be installed in wheeled insulated containers with battery-powered thermostatically controlled fans. My calculations indicate two of these units per carriage would be capable of cooling the air in the carriage from 30 C to 20 C for the duration of the journey from White City to Stratford. At Stratford the units would be substituted with fresh ones by LU staff (hired for the duration of the warm conditions) for the return journey to White City. Both White City and Stratford have sufficient space and access to fresh air for commercial deep-freezes (rented for the duration of the warm conditions) to have fresh freezer packs available. The 50kg wheeled units would need to be secured appropriately to prevent theft/malicious damage. Similar approach to be used for other sections of the deep tube network
What do people think?