为满足铁路不断增长的货物运输需求，开行重载组合列车是一种有效提高运输能力的方法。
To meet the ever-increasing demand for the railway transportation, the operation of heavy-haul trains is an effective way to improve transport capacity.
组合式重载列车已在我国大秦铁路广泛开行，取得了显著的经济效率和社会效益。
Combined heavy rail trains have been widely opened in China Datong-Qinhuangdao line, which has made significant economic efficiency and social benefits.
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