Various electric multiple unit (EMU) train models are on display during Modern Railways 2019, an international exhibition on modern railway technology and equipment, at China National Convention Center in Beijing, capital of China, Nov. 20, 2019. (Xinhua/Zhang Chenlin)

A model of Czech's Leo Express electric multiple unit (EMU) train is on display during Modern Railways 2019, an international exhibition on modern railway technology and equipment, at China National Convention Center in Beijing, capital of China, Nov. 20, 2019. (Xinhua/Zhang Chenlin)

Visitors look at a smart railway station monitoring system during Modern Railways 2019, an international exhibition on modern railway technology and equipment, at China National Convention Center in Beijing, capital of China, Nov. 20, 2019. (Xinhua/Zhang Chenlin)

Visitors look at a maglev train model during Modern Railways 2019, an international exhibition on modern railway technology and equipment, at China National Convention Center in Beijing, capital of China, Nov. 20, 2019. (Xinhua/Zhang Chenlin)

A visitor looks at electric multiple unit (EMU) train models on display during Modern Railways 2019, an international exhibition on modern railway technology and equipment, at China National Convention Center in Beijing, capital of China, Nov. 20, 2019. (Xinhua/Zhang Chenlin)