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Contributing to our specialized maintenance team, we have undertaken projects of overhaul and retrofit business of mass transit vehicle door system including Shanghai Line 3 & 4 & 6 & 8 Door Overhaul Project, 10-year Overhaul Project of Shanghai Line 5, Nanjing Line 1 & 2 Door Overhaul Project and so on. We have also won projects of high-speed train door maintenance and retrofit as well as main line train door maintenance and retrofit in big cities such as Shanghai, Beijing, Guangzhou etc.