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Daily Telegraph: 150 fascinating Tube facts
On 2013\01\15 11:53, Roland Perry wrote:
In message , at 11:24:03 on Tue, 15 Jan 2013, David Walters remarked: davros.org lists Marble Arch as having a fixed stairway. That confirms my recollection (a stairway alongside one of the escalators, but not at the same angle so it's succession of half a dozen steps, landing etc) Is that a safety thing? If you slip you will stop at the next landing rather than tumbling all the way to the bottom. It seems rare to find very long unbroken flights of stairs. It's because the natural 'angle' of escalators and stairs are different, due to the different step dimensions. The landings are needed to keep the two in synch. I think you might have put the cart before the horse... I think the step size of escalators is deliberately different to the step size of steps in order to ensure that a flight of escalators and multiple flights of steps with landings can occupy the same shaft. |
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