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Derail Valley
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Weather/4/zh-hant
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From Derail Valley
大多數
鐵路動力車輛
配有
雨刷
，以幫助清除擋風玻璃上的雨滴。它們也多配有
砂撒
，以助提高在潮濕條件下的
牽引力
。
