?Chinese railcar-maker CRRC Qingdao Sifang Co. Ltd. announced on Saturday that it has delivered the country's first subway train designed especially for a mountainous region.

The six-car train will run on Line 5 in Chongqing Municipality in southwest China.

Chongqing is a city of hills. The deepest section of the Line 5 subway is about 70 meters underground, making it the deepest metro line in China.

The train with a carrying capacity of 2,322 passengers can run at a maximum speed of 100 km per hour. The producer said that it has contracted to make 39 such trains for Chongqing.

CRRC Qingdao Sifang Co. Ltd. won the contract to develop a new type of train with larger driving force and smaller turning radius, It has a 50 percent better slope performance than conventional trains.

Located in east China's port city of Qingdao, CRRC Qingdao Sifang designs and manufactures a variety of bullet trains, subway trains and trams. Many of its products have special functions, for example, those adapting to extreme cold and high altitude or environmentally friendly hydrogen-powered engines.