WUHAN, Jan. 29, 2016 (Xinhua) -- Wu Huan, a mechanic, maintains a bullet train at a bullet train maintaining center in Wuhan, central China's Hubei Province, Jan. 29, 2016. Workers are occupied in the maintenance of bullet trains to keep them in good condition for the Spring Festival travel rush, which kicked off on Jan. 24. Spring Festival, China's most important holiday centering on family reunions, will fall on Feb. 8. (Xinhua/Xiao Yijiu)

WUHAN, Jan. 29, 2016 (Xinhua) -- A mechanic goes to check a bullet train at a bullet train maintaining center in Wuhan, central China's Hubei Province, Jan. 29, 2016. Workers are occupied in the maintenance of bullet trains to keep them in good condition for the Spring Festival travel rush, which kicked off on Jan. 24. Spring Festival, China's most important holiday centering on family reunions, will fall on Feb. 8. (Xinhua/Xiao Yijiu)

WUHAN, Jan. 29, 2016 (Xinhua) -- Mechanics maintain bullet trains outside a bullet train maintaining center in Wuhan, central China's Hubei Province, Jan. 29, 2016. Workers are occupied in the maintenance of bullet trains to keep them in good condition for the Spring Festival travel rush, which kicked off on Jan. 24. Spring Festival, China's most important holiday centering on family reunions, will fall on Feb. 8. (Xinhua/Xiao Yijiu)

WUHAN, Jan. 29, 2016 (Xinhua) -- Mechanic Yang Teng (R) checks a bullet train at a bullet train maintaining center in Wuhan, central China's Hubei Province, Jan. 29, 2016. Workers are occupied in the maintenance of bullet trains to keep them in good condition for the Spring Festival travel rush, which kicked off on Jan. 24. Spring Festival, China's most important holiday centering on family reunions, will fall on Feb. 8. (Xinhua/Xiao Yijiu)

HULUN BUIR, Jan. 29, 2016 (Xinhua) -- Photo taken on Jan. 22, 2016 shows wiremen checking wires along the rail in Genhe City, north China's Inner Mongolia Autonomous Region. Though the temperature in Genhe reached near minus 50 degrees Celsius, railway workers work outdoors as ususal to ensure safe train operations during the Spring Festival travel rush.(Xinhua/Zou Jianpu)

HULUN BUIR, Jan. 29, 2016 (Xinhua) -- Photo taken on Jan. 22, 2016 shows wiremen checking wires along the rail in Genhe City, north China's Inner Mongolia Autonomous Region. Though the temperature in Genhe reached near minus 50 degrees Celsius, railway workers work outdoors as ususal to ensure safe train operations during the Spring Festival travel rush.(Xinhua/Zou Jianpu)

HULUN BUIR, Jan. 29, 2016 (Xinhua) -- Photo taken on Jan. 22, 2016 shows a wireman getting on a train, ready to patrol wires along the rail in Genhe City, north China's Inner Mongolia Autonomous Region. Though the temperature in Genhe reached near minus 50 degrees Celsius, railway workers work outdoors as ususal to ensure safe train operations during the Spring Festival travel rush.(Xinhua/Zou Jianpu)

HULUN BUIR, Jan. 29, 2016 (Xinhua) -- Photo taken on Jan. 22, 2016 shows wiremen patrolling wires along the rail in Genhe City, north China's Inner Mongolia Autonomous Region. Though the temperature in Genhe reached near minus 50 degrees Celsius, railway workers work outdoors as ususal to ensure safe train operations during the Spring Festival travel rush.(Xinhua/Zou Jianpu)

JINAN, Jan. 29, 2016 (Xinhua) -- A worker checks train carriages at a maintenance workshop of Jinan railway section, east China's Shandong Province, Jan. 29, 2016. The maintenance workshop was in charge of the repair work of 1,600 trains of Jinan railway bureau. (Xinhua/Zhou Ke)

JINAN, Jan. 29, 2016 (Xinhua) -- A worker tears down train components at a maintenance workshop of Jinan railway section, east China's Shandong Province, Jan. 29, 2016. The maintenance workshop was in charge of the repair work of 1,600 trains of Jinan railway bureau. (Xinhua/Zhou Ke)

JINAN, Jan. 29, 2016 (Xinhua) -- A worker installs broadcast equipments on a train at a maintenance workshop of Jinan railway section, east China's Shandong Province, Jan. 29, 2016. The maintenance workshop was in charge of the repair work of 1,600 trains of Jinan railway bureau. (Xinhua/Zhou Ke)

JINAN, Jan. 29, 2016 (Xinhua) -- Workers check train carriages at a maintenance workshop of Jinan railway section, east China's Shandong Province, Jan. 29, 2016. The maintenance workshop was in charge of the repair work of 1,600 trains of Jinan railway bureau. (Xinhua/Zhou Ke)

JINAN, Jan. 29, 2016 (Xinhua) -- A worker checks running gear of a train at a maintenance workshop of Jinan railway section, east China's Shandong Province, Jan. 29, 2016. The maintenance workshop was in charge of the repair work of 1,600 trains of Jinan railway bureau. (Xinhua/Zhou Ke)