twin-tube tunnel
... twin-track railway双轨铁路 twin-tube tunnel双管隧道 two-axle bus两轴巴士 ...
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根据设计者的设计,将允许有每天大约300辆火车穿梭在圣哥达的双管隧道中,最高设计时速达250Km/h(155mph)。
Around 300 trains should be able to speed through the Gotthard's twin tubes every day, at up to 250 kilometers per hour (155 mph) for passenger trains, according to planners.
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