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In page Tianjin:

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The Tianjin Metro was formerly operated by two companies, Tianjin Metro General Corporation and Tianjin Binhai Mass Transit Development Company. However, in 2017, the two companies merged to form the Tianjin Rail Transit Group Corporation. It is currently under expansion to create five to nine lines.[citation needed] A total of six lines are currently operating in the city and the Binhai area. As of April 2019, the entire network of Tianjin Metro has 155 stations and 6 lines.