The first train of Jinan metro line 3 is unveiled in Licheng district of Jinan, Shandong province on May 20. Metro line 3 is expected to start trial operation this October. [Photo/dzwww.com]

Mainly located in the eastern part of the city, the metro line covers a distance of 21.57 kilometers and starts from the Longdongzhuang Station to Tantou Station. The average station space is about 1.7 kilometers. [Photo/dzwww.com]

Unlike the red and white body of trains in line 1, the trains of metro line 3 feature blue and white colors. The photo shows the inner arrangement. [Photo/dzwww.com]

USB charging ports are installed in the trains, the first service of its kind in China. [Photo/dzwww.com]

Photo taken on May 20 shows the cab of the train of metro line 3. [Photo/dzwww.com]