It is the key issue to affect the operation safety that air charge once more when trains apply cycle breaking on Downhill Slope interval.
列车在下坡道区间循环制动时的再充气是影响列车安全运行的关键问题。
The tracks that every train enters and exits stations are built up downhill and uphill to reduce the subway operation costs.
每辆地铁在出站时轨道都是下坡的，进站时的轨道都是上坡的，这样的设计可以降低运营成本。
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