The first metro¹ line running under the Yellow River, China's second longest river, started trial operation on Sunday in Lanzhou, capital of northwest China's Gansu Province.

 

中国首条穿越黄河的地铁周日在甘肃兰州开始试运行。

 

The city is located on the upper reaches of China's "mother river," which runs 5,464 km from west to east before entering the Pacific.

 

The fast urban transit² has been a dream for 3 million residents in the city, where the river runs through the middle, creating a heavy traffic pressure on the road bridge. Construction of the metro line started in 2014

 

The 25.9-km long section in service on Sunday is the first phase of Lanzhou Metro Line 1, passing through four urban districts of Lanzhou from east to west.

 

The first metro line in Lanzhou is also the first rail transit line crossing the Yellow River in China. The tunnel passes through a pebble³ layer with a depth of 200 to 300 meters, which is highly permeable and unstable⁴.

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