It is understood that there are only a handful of narrow-gauge railways remaining in China, including the Jiayang narrow gauge in Qianwei county, Southwest China's Sichuan province. Built in 1958, it has a total length of 19.8 kilometers, a gauge of 762 mm, six tunnels, 109 arcs and a maximum slope of 36 radians. The passenger steam train is dubbed "the living fossil of China's industrial revolution", and a national treasure even more precious than the giant panda. The railway has lost their original function and developed into tourist route.