The photo shows the grand bridge, Beipanjiang Arch Bridge at Hukun high-speed railway line linking the city of Xinhuang in Hunan with Guizhou's capital Guiyang [Photo: CNTV.com]

Chinese rail authorities have begun testing on a high-speed railway line linking the city of Xinhuang in Hunan with Guizhou's capital Guiyang.

The Xinhuang-Guiyang line is part of the Hukun high-speed line linking Shanghai and Yunnan's capital, Kunming.

Authorities building the line say the construction of Guizhou section is going to be the most difficult portion.

This includes a bridge to be built across the Beipanjiang River in Guizhou.

Zhang Shuangyang is in-charge of building a scale model of Beipanjiang Bridge.

"We're designing the bridge to ensure both a smooth ride, as well as to prevent the bridge from deforming. We have attached counter-weights on each section of the scale model. We're also assessing the concrete to make sure it can properly handle the weight of the bridge. This should allow us to better estimate the stress the bridge will be under."

The planned Beipanjiang Bridge will be 450 meters in length.

The Guizhou section of Hukun high-speed railway line is expected to be finished by June.