Aerial photo taken on Dec. 30, 2019 shows the arch bridge of Dali-Ruili railway over Nujiang River in southwest China's Yunnan Province. The arch bridge of Dali-Ruili railway over Nujiang River, with a span of 1,024.2 meters, will shorten the travel time of Dali to Ruili from six hours to two hours after its completion. (Photos: Xinhua)

Aerial photo taken on Dec. 30, 2019 shows the arch bridge of Dali-Ruili railway over Nujiang River in southwest China's Yunnan Province. The arch bridge of Dali-Ruili railway over Nujiang River, with a span of 1,024.2 meters, will shorten the travel time of Dali to Ruili from six hours to two hours after its completion.

Workers work at the construction site of the arch bridge of Dali-Ruili railway over Nujiang River in southwest China's Yunnan Province, Dec. 30, 2019. The arch bridge of Dali-Ruili railway over Nujiang River, with a span of 1,024.2 meters, will shorten the travel time of Dali to Ruili from six hours to two hours after its completion.

Workers work at the construction site of the arch bridge of Dali-Ruili railway over Nujiang River in southwest China's Yunnan Province, Dec. 30, 2019. The arch bridge of Dali-Ruili railway over Nujiang River, with a span of 1,024.2 meters, will shorten the travel time of Dali to Ruili from six hours to two hours after its completion.

Aerial photo taken on Dec. 30, 2019 shows the arch bridge of Dali-Ruili railway over Nujiang River in southwest China's Yunnan Province. The arch bridge of Dali-Ruili railway over Nujiang River, with a span of 1,024.2 meters, will shorten the travel time of Dali to Ruili from six hours to two hours after its completion.