Tianjin is a very peculiar city and can be divided in two clear urban areas:
the main one, including the old city, on the Center-to-North-West of Tianjin, and Binhai, a brand new development area laid towards the East coast of the city.
Most of the Metro Network belongs to the old city, with only part of Line 9 and the TEDA Tram Line developed in the new Binhai area.
With a total length of over 150km (90+ miles) and several lines under construction, Tianjin Metro is projected to double its size by 2020.
Download Tianjin Metro on the App Store, free.