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Int'l rail transit expo opens in Changsha

Picture 1: Visitors view a signal control system at an international rail transit expo in Changsha, central China's Hunan Province, Nov. 28, 2016. The expo and a high-speed rail economic forum kicked off here on Monday. 

Picture 2: Visitors view an air conditioning system at an international rail transit expo in Changsha, central China's Hunan Province, Nov. 28, 2016. The expo and a high-speed rail economic forum kicked off here on Monday.

Picture 3: An exhibitor shows a ticket purchase machine at an international rail transit expo in Changsha, central China's Hunan Province, Nov. 28, 2016. The expo and a high-speed rail economic forum kicked off here on Monday.

Picture 4: Photo taken on Nov. 28, 2016 shows an international rail transit expo in Changsha, central China's Hunan Province. The expo and a high-speed rail economic forum kicked off here on Monday.

Picture 5: Visitors view a tram car operation system at an international rail transit expo in Changsha, central China's Hunan Province, Nov. 28, 2016. The expo and a high-speed rail economic forum kicked off here on Monday.

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