‘Like a sauna’: London tube travellers swelter in temperatures higher than legal limit for cattle

The tube cannot easily be adapted to cope with heatwaves, making conditions almost unbearableAs the escalator descends below ground at King’s Cross St Pancras station in London, the shift from what was already a hot station entrance to the furnace-like subterranean depths is perceptible.On the tube it’s worse: a man leans back in his seat, eyes closed, sweltering; people hold electric fans an inch away from their fa…