The tube at a standstill: why TfL stopped people walking up the escalators https://t.co/85USIOcGhp
— Dr.Steven D.Sanders (@DocEngineering) January 17, 2016
The tube at a standstill: why TfL stopped people walking up the escalators https://t.co/85USIOcGhp
— Dr.Steven D.Sanders (@DocEngineering) January 17, 2016
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