The tube at a standstill: why TfL stopped people walking up the escalators

It’s British lore: on escalators, you stand on the right and walk on the left. So why did the London Underground ask grumpy commuters to stand on both sides? And could it help avert a looming congestion crisis? On 4 December last year, the London Underground ingested 4,821,000 passengers and spat them out at their destinations, and in doing so set a new record for a single day. If you paused to contemplate this for a moment, you might think...
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