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Its largest suppliers of steel and iron included China, Japan, South Korea and India, said the General Department of Vietnam Customs.

Among the cargo was 5.02 million tons of grain and fertilizers, a 28.2-percent increase year-on-year, the data shows.

The coal sub-index slid 5.6 percent to 1,071.72.

An overhaul for the Datong-Qinhuangdao railway has been recently carried out on a daily basis to secure safe and smooth rail operations.

A total of 948 million tons of cargo was transported on China's railways in the period, 25.87 million tons more than that in the same period last year, according to the company.

Adjustments part of routine operation that will also boost shipments of coal.

The railway construction project is slated for completion in 2023.

Region boasts rich renewable energy resources and carbon sink capacity.