An engineer conducts electrical tests on a BYD SkyShuttle train during a trial operation in Bishan District of southwest China's Chongqing, June 3, 2020. Chongqing's first SkyShuttle rail transit project has been unveiled recently, featuring electric-powered, rubber-wheeled trains running on a 15.4-km rail line with 15 stations. The project will provide passengers with quiet and safe travel services upon its estimated public operation in September 2020.

Aerial photo taken on June 3, 2020 shows a BYD SkyShuttle train during a trial operation in Bishan District of southwest China's Chongqing. Chongqing's first SkyShuttle rail transit project has been unveiled recently, featuring electric-powered, rubber-wheeled trains running on a 15.4-km rail line with 15 stations. The project will provide passengers with quiet and safe travel services upon its estimated public operation in September 2020.

Aerial photo taken on June 3, 2020 shows a BYD SkyShuttle train during a trial operation in Bishan District of southwest China's Chongqing. Chongqing's first SkyShuttle rail transit project has been unveiled recently, featuring electric-powered, rubber-wheeled trains running on a 15.4-km rail line with 15 stations. The project will provide passengers with quiet and safe travel services upon its estimated public operation in September 2020.

An engineer tests the autopiloting system of a BYD SkyShuttle train during a trial operation in Bishan District of southwest China's Chongqing, June 3, 2020. Chongqing's first SkyShuttle rail transit project has been unveiled recently, featuring electric-powered, rubber-wheeled trains running on a 15.4-km rail line with 15 stations. The project will provide passengers with quiet and safe travel services upon its estimated public operation in September 2020.

A BYD SkyShuttle train is seen during a trial operation in Bishan District of southwest China's Chongqing, June 3, 2020. Chongqing's first SkyShuttle rail transit project has been unveiled recently, featuring electric-powered, rubber-wheeled trains running on a 15.4-km rail line with 15 stations. The project will provide passengers with quiet and safe travel services upon its estimated public operation in September 2020.

A BYD SkyShuttle train is seen during a trial operation in Bishan District of southwest China's Chongqing, June 3, 2020. Chongqing's first SkyShuttle rail transit project has been unveiled recently, featuring electric-powered, rubber-wheeled trains running on a 15.4-km rail line with 15 stations. The project will provide passengers with quiet and safe travel services upon its estimated public operation in September 2020. (Photos: Xinhua)

Aerial photo taken on June 3, 2020 shows a BYD SkyShuttle train during a trial operation in Bishan District of southwest China's Chongqing. Chongqing's first SkyShuttle rail transit project has been unveiled recently, featuring electric-powered, rubber-wheeled trains running on a 15.4-km rail line with 15 stations. The project will provide passengers with quiet and safe travel services upon its estimated public operation in September 2020.

Aerial photo taken on June 3, 2020 shows a BYD SkyShuttle train during a trial operation in Bishan District of southwest China's Chongqing. Chongqing's first SkyShuttle rail transit project has been unveiled recently, featuring electric-powered, rubber-wheeled trains running on a 15.4-km rail line with 15 stations. The project will provide passengers with quiet and safe travel services upon its estimated public operation in September 2020.