Around 300 trains should be able to speed through the Gotthard's twintubes every day, at up to 250 kilometers per hour (155 mph) for passenger trains, according to planners.
Vehicle twin- photoelectrical pointing system mainly consists of reflex light-tubes, a autocollimation theodolite and modulators.
车载双联光电瞄准系统主要由折转光管、自准直经纬仪和相应的调制器组成。
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The 2080 features bass-reflex tuning through twin port tubes providing optimal low-frequency tuning, enhancing the already substantial bass output from this high quality enclosure.