Our country's railroad has the character of heavy load, complex network structure and train type, which aggravate the difficulty of train diagram establishment;
我国铁路负荷重、路网结构和开行列车种类复杂的特点更加大了列车运行图编制的难度；
Iron ore is about as heavy a load as a train can bear.
铁矿石可以说是列车拉得最吃力的一种货物了。
Iron ore is about as heavy a load as a train can bear.
铁矿石可以说是列车拉得最吃力的一种货物了。
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