The tube is, in most parts, old. It’s not as fast as you think (average speed, stops included, is under 30 mph). It (usually) beats walking, but you’ll spend more time than you expected walking through its labyrinthine subterranean passages, particularly if you’re changing lines at a station. At peak times, you may wait for two or even three trains before there’s space to board. And your journey may be affected by closures (‘engineering works’) or out-of-service elevators (‘lifts’), forcing you into 100 or 200 step journeys to and/or from the surface (‘surface’). Finally, the tube map, for all its elegance, is far from a faithful representation of the city, so don’t assume that a tube journey is the s
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