In the time it takes some countries to slightly extend one train station platform, China can rustle up entire high-speed railways. And this stunning drone footage shows what incredible feats of engineering they can be. The clip shows 160mph trains running along the now completed 411-mile Xi'an to Chengdu high-speed line, which was started in October 2012. The clip shows 160mph trains running along the now completed 411-mile Xi'an to Chengdu high-speed line, which was started in October 2012 To connect Xi'an with Chengdu engineers had to tackle the fearsome Qinling Mountains that divide northern and southern China It's something to behold, with the £8billion (71bn yuan) line – finished in December 2017 - passing amid towering mountains and through huge tunnels. To connect the two cities engineers had to tackle the fearsome Qinling Mountains that divide northern and southern China and thread the track underneath numerous environmentally sensitive areas.