“…The experience of operating and travelling on the Underground in London prior to the opening of deep-level tube lines was, therefore, fundamentally different from that of the Paris Métro (1900) or the New York Subway (1904), both of which were powered and lit by electricity from the outset, a power source that had already been proved by two decades of above-ground tramways, elevated railways and street lighting 5 . Remarkably, in the entire period from 1 863 to 1905, there were no fatal accidents on London's underground railways attributable to the hazards of either steam traction or gas poisoning, while the first major disaster on the Métro, at Couronnes in 1903, caused by a prolonged electrical fire spreading smoke into a station plunged into darkness by the knock-on effects of the fire, demonstrated the fragility even of supposedly safer, cleaner electricity 6 . It was an accident which might have been expected if the system had involved a mixture of steam power and gas, where sparks from the locomotive could have ignited leaking gas or a collision or derailment might have caused the puncture of a gasbag ; but it was not what was anticipated with electric trains and electric lights.…”