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$In this aerial photo taken on June 23, 2018, workers construct a bridge in the Gansu-Ningxia section of the Yinchuan-Xi\'an high-speed railway in northwest China\'s Ningxia Hui Autonomous Region. The 617-kilometer high-speed railway is scheduled to start operation by the end of 2020 with a design speed of 250 kilometers per hour. (Xinhua/Hou Dongtao)$

In this aerial photo taken on June 23, 2018, workers construct a bridge in the Gansu-Ningxia section of the Yinchuan-Xi'an high-speed railway in northwest China's Ningxia Hui Autonomous Region. The 617-kilometer high-speed railway is scheduled to start operation by the end of 2020 with a design speed of 250 kilometers per hour. (Xinhua/Hou Dongtao)

$In this aerial photo taken on June 23, 2018, workers make prefabricated building parts for the Gansu-Ningxia section of the Yinchuan-Xi\'an high-speed railway in northwest China\'s Ningxia Hui Autonomous Region. The 617-kilometer high-speed railway is scheduled to start operation by the end of 2020 with a design speed of 250 kilometers per hour. (Xinhua/Wang Peng)$

In this aerial photo taken on June 23, 2018, workers make prefabricated building parts for the Gansu-Ningxia section of the Yinchuan-Xi'an high-speed railway in northwest China's Ningxia Hui Autonomous Region. The 617-kilometer high-speed railway is scheduled to start operation by the end of 2020 with a design speed of 250 kilometers per hour. (Xinhua/Wang Peng)

$This aerial photo taken on June 23, 2018 shows prefabricated building parts for the Gansu-Ningxia section of the Yinchuan-Xi\'an high-speed railway in northwest China\'s Ningxia Hui Autonomous Region. The 617-kilometer high-speed railway is scheduled to start operation by the end of 2020 with a design speed of 250 kilometers per hour. (Xinhua/Wang Peng)$

This aerial photo taken on June 23, 2018 shows prefabricated building parts for the Gansu-Ningxia section of the Yinchuan-Xi'an high-speed railway in northwest China's Ningxia Hui Autonomous Region. The 617-kilometer high-speed railway is scheduled to start operation by the end of 2020 with a design speed of 250 kilometers per hour. (Xinhua/Wang Peng)

$Workers make prefabricated building parts for the Gansu-Ningxia section of the Yinchuan-Xi\'an high-speed railway in northwest China\'s Ningxia Hui Autonomous Region, June 23, 2018. The 617-kilometer high-speed railway is scheduled to start operation by the end of 2020 with a design speed of 250 kilometers per hour. (Xinhua/Wang Peng)$

Workers make prefabricated building parts for the Gansu-Ningxia section of the Yinchuan-Xi'an high-speed railway in northwest China's Ningxia Hui Autonomous Region, June 23, 2018. The 617-kilometer high-speed railway is scheduled to start operation by the end of 2020 with a design speed of 250 kilometers per hour. (Xinhua/Wang Peng)

$A worker makes prefabricated building parts for the Gansu-Ningxia section of the Yinchuan-Xi\'an high-speed railway in northwest China\'s Ningxia Hui Autonomous Region, June 23, 2018. The 617-kilometer high-speed railway is scheduled to start operation by the end of 2020 with a design speed of 250 kilometers per hour. (Xinhua/Lin Fanjing)$

A worker makes prefabricated building parts for the Gansu-Ningxia section of the Yinchuan-Xi'an high-speed railway in northwest China's Ningxia Hui Autonomous Region, June 23, 2018. The 617-kilometer high-speed railway is scheduled to start operation by the end of 2020 with a design speed of 250 kilometers per hour. (Xinhua/Lin Fanjing)