Workers lay long tracks on a railway section in Yulin Town of Yubei District, southwest China's Chongqing, Nov. 10, 2020. Workers from China Railway No. 8 Engineering Group Co., Ltd. started to lay 500-meter-long tracks on the railway section between Miaoba Railway Station and Longsheng Railway Station, a part of the Chongqing railway east loop line project. (Xinhua/Tang Yi)

Workers lay long tracks on a railway section in Yulin Town of Yubei District, southwest China's Chongqing, Nov. 10, 2020. Workers from China Railway No. 8 Engineering Group Co., Ltd. started to lay 500-meter-long tracks on the railway section between Miaoba Railway Station and Longsheng Railway Station, a part of the Chongqing railway east loop line project. (Xinhua/Tang Yi)

Aerial photo taken on Nov. 9, 2020 shows a train carrying long tracks at the construction site of Chongqing railway east loop line project in Yulin Town of Yubei District, southwest China's Chongqing. Workers from China Railway No. 8 Engineering Group Co., Ltd. started to lay 500-meter-long tracks on the railway section between Miaoba Railway Station and Longsheng Railway Station, a part of the Chongqing railway east loop line project. (China Railway No. 8 Engineering Group Co., Ltd./Handout via Xinhua)

Workers lay long tracks on a railway section in Yulin Town of Yubei District, southwest China's Chongqing, Nov. 10, 2020. Workers from China Railway No. 8 Engineering Group Co., Ltd. started to lay 500-meter-long tracks on the railway section between Miaoba Railway Station and Longsheng Railway Station, a part of the Chongqing railway east loop line project. (Xinhua/Tang Yi)

Photo taken on Nov. 9, 2020 shows long tracks are being laid at the construction site of Chongqing railway east loop line project in Yulin Town of Yubei District, southwest China's Chongqing. Workers from China Railway No. 8 Engineering Group Co., Ltd. started to lay 500-meter-long tracks on the railway section between Miaoba Railway Station and Longsheng Railway Station, a part of the Chongqing railway east loop line project. (China Railway No. 8 Engineering Group Co., Ltd./Handout via Xinhua)

Workers lay long tracks on a railway section in Yulin Town of Yubei District, southwest China's Chongqing, Nov. 10, 2020. Workers from China Railway No. 8 Engineering Group Co., Ltd. started to lay 500-meter-long tracks on the railway section between Miaoba Railway Station and Longsheng Railway Station, a part of the Chongqing railway east loop line project. (Xinhua/Tang Yi)