China has unveiled the world's first battery-powered trains that hang from the suspended track in mid-air.

The hanging train carriages, which are powered by lithium batteries, were filmed in action during its test run in Chengdu, capital of Sichuan province, at a speed of 60 km/h on the upside down monorail, according to The Straits Times. It successfully ran along the 300-meter test section of the track last Friday.

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Each carriage has the load capacity of up to 120 passengers, Zhan Wanming of Southwest Jiaotong University, chief designer of the project, said. Suspension trains usually have six carriages, according to Daily Mail.

Zhai said that the suspension system is more cost-effective as it is estimated to fall between one-fifth and one-eighth the cost of an underground railway per kilometer and environmentally friendly compared with its electric and diesel rail systems counterparts, Mirror reported.

Other test sections of the line will be expanded to conduct further tests including the train's performance capabilities like its turning and climbing maneuvers. The battery charging stations will also be inspected.

"The test runs will continue for tens of thousands of kilometers to check performance capabilities before official operation," Zhai told People's Daily China.

So far, official opening date for the line has not been announced yet.

Meanwhile, Chengdu is the first Chinese city to launch a suspension railway. Although Shanghai initially announced its futuristic suspended 'Skytrain' at the China International Rail Transit Technology Exhibition last year, it will follow Chengdu's track in 2017.

However, unlike Chengdu's trains, Shanghai plans to have just four carriages with a capacity of up to 70 passengers only. It will run at around 30 km/h and is estimated to cost between 120 million ($18 million) and 150 million ($22.49 million).

Tagssuspension railway, hanging train, china, trains, battery-operated train, China Train, Skytrain