Why It's Unique: About 23 miles worth of 2-foot-gaugetrack run along the MailRail, which is 70 feet below the hustle andbustle of London's streets.
独特之处： 约23英里长，2英尺直径的轨沿道线“MailRail” 邮政铁路，运行在伦敦喧嚣都市的大街小巷下70英尺的地下。
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