A small case! The one hundred and twenty empty cars is just a small case for the two HXD1s.
A pair of SS4G were leading about a hundred cars back to Datong,while a SS4G was leading the ten-thousand-tons heavy haul combined train went to Qinghuangdao.
CNR's unit heavy-haul combined train on Datong-Qinhuangdao railway.
The weight of this train was 12,000 tons.