Innotrans railway trade fair opens in Berlin, highlighting digitalization

A visitor walks past a tram displayed at the "Innotrans" railway industry trade fair in Berlin, capital of Germany, on Sept. 18, 2018. The bi-annual "Innotrans" railway industry trade fair, the largest of its kind in the world, opened on Tuesday in Berlin, with a focus on autonomous and digital technologies. (Xinhua/Shan Yuqi)