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$Workers carry steel rails on the construction site of Xi\'an Railway Station in Xi\'an, capital of northwest China\'s Shaanxi Province, Jan. 15, 2019. After six hours of continuous overnight work of 1,000 plus workers, the reconstruction and extension project of the Xi\'an Railway Station entered the phase of main project construction on Tuesday, which laid a solid foundation for the upcoming Spring Festival travel rush.(Xinhua/Tao Ming)$

Workers carry steel rails on the construction site of Xi'an Railway Station in Xi'an, capital of northwest China's Shaanxi Province, Jan. 15, 2019. After six hours of continuous overnight work of 1,000 plus workers, the reconstruction and extension project of the Xi'an Railway Station entered the phase of main project construction on Tuesday, which laid a solid foundation for the upcoming Spring Festival travel rush.(Xinhua/Tao Ming)

$Workers cut steel rail on the construction site of Xi\'an Railway Station in Xi\'an, capital of northwest China\'s Shaanxi Province, Jan. 15, 2019. After six hours of continuous overnight work of 1,000 plus workers, the reconstruction and extension project of the Xi\'an Railway Station entered the phase of main project construction on Tuesday, which laid a solid foundation for the upcoming Spring Festival travel rush.(Xinhua/Tao Ming)$

Workers cut steel rail on the construction site of Xi'an Railway Station in Xi'an, capital of northwest China's Shaanxi Province, Jan. 15, 2019. After six hours of continuous overnight work of 1,000 plus workers, the reconstruction and extension project of the Xi'an Railway Station entered the phase of main project construction on Tuesday, which laid a solid foundation for the upcoming Spring Festival travel rush.(Xinhua/Tao Ming)

$A worker conducts on the construction site of Xi\'an Railway Station in Xi\'an, capital of northwest China\'s Shaanxi Province, Jan. 15, 2019. After six hours of continuous overnight work of 1,000 plus workers, the reconstruction and extension project of the Xi\'an Railway Station entered the phase of main project construction on Tuesday, which laid a solid foundation for the upcoming Spring Festival travel rush.(Xinhua/Tao Ming)$

A worker conducts on the construction site of Xi'an Railway Station in Xi'an, capital of northwest China's Shaanxi Province, Jan. 15, 2019. After six hours of continuous overnight work of 1,000 plus workers, the reconstruction and extension project of the Xi'an Railway Station entered the phase of main project construction on Tuesday, which laid a solid foundation for the upcoming Spring Festival travel rush.(Xinhua/Tao Ming)

$Workers connect rails on the construction site of Xi\'an Railway Station in Xi\'an, capital of northwest China\'s Shaanxi Province, Jan. 15, 2019. After six hours of continuous overnight work of 1,000 plus workers, the reconstruction and extension project of the Xi\'an Railway Station entered the phase of main project construction on Tuesday, which laid a solid foundation for the upcoming Spring Festival travel rush. (Xinhua/Tao Ming)$

Workers connect rails on the construction site of Xi'an Railway Station in Xi'an, capital of northwest China's Shaanxi Province, Jan. 15, 2019. After six hours of continuous overnight work of 1,000 plus workers, the reconstruction and extension project of the Xi'an Railway Station entered the phase of main project construction on Tuesday, which laid a solid foundation for the upcoming Spring Festival travel rush. (Xinhua/Tao Ming)

$Workers reform the circuit network on the construction site of Xi\'an Railway Station in Xi\'an, capital of northwest China\'s Shaanxi Province, Jan. 15, 2019. After six hours of continuous overnight work of 1,000 plus workers, the reconstruction and extension project of the Xi\'an Railway Station entered the phase of main project construction on Tuesday, which laid a solid foundation for the upcoming Spring Festival travel rush. (Xinhua/Xu Yunhua)$

Workers reform the circuit network on the construction site of Xi'an Railway Station in Xi'an, capital of northwest China's Shaanxi Province, Jan. 15, 2019. After six hours of continuous overnight work of 1,000 plus workers, the reconstruction and extension project of the Xi'an Railway Station entered the phase of main project construction on Tuesday, which laid a solid foundation for the upcoming Spring Festival travel rush. (Xinhua/Xu Yunhua)

$Workers are seen on the construction site of Xi\'an Railway Station in Xi\'an, capital of northwest China\'s Shaanxi Province, Jan. 15, 2019. After six hours of continuous overnight work of 1,000 plus workers, the reconstruction and extension project of the Xi\'an Railway Station entered the phase of main project construction on Tuesday, which laid a solid foundation for the upcoming Spring Festival travel rush.(Xinhua/Tao Ming)$

Workers are seen on the construction site of Xi'an Railway Station in Xi'an, capital of northwest China's Shaanxi Province, Jan. 15, 2019. After six hours of continuous overnight work of 1,000 plus workers, the reconstruction and extension project of the Xi'an Railway Station entered the phase of main project construction on Tuesday, which laid a solid foundation for the upcoming Spring Festival travel rush.(Xinhua/Tao Ming)