That map of Tianjin’s metro lines is becoming busier with every year: we now have Lines 1, 2, 3, 5, 6, and 9 opened to the public already. You’ll want to add two more lines to this, as the city by the Bohai Sea is finalising routes for Lines 7 and 11.
As lines go for a literally crooked (as in full of curves) city, Line 7 is a very straightforward north-south line, with Line 11 its equivalent turned at a right angle, it being a major west-east route. The two lines will meet at Balitai (八里台) station, just south of the Haiguangsi crossing of the major through route, Nanjing Road.
Line 7 will run for just over 26 km (26.533 to be exact), with 21 stations forming the all-underground route. The line will start just miles north of the city’s North Railway Station, at Yuguan Road (榆关路) station. It will have at least 12 interchange stations, including one at the rather medically-inclined-by-name Tumour Hospital (Zhongliu Yiyuan; 肿瘤医院) station, which is presently a cross-platform interchange between Lines 5 and 6. The line hits closest home to the heart of Tianjin at the Drum Tower (鼓楼) station, which is where it shares the stop with Line 2. It also meets the very busy Line 1 at Haiguangsi.
Line 11 is a 22.6 km underground route, which in its first phase will start from the Tianjin Water Park (Shuisihanggongyuan; 水上公园) and head east via the Balitai interchange with Line 7 to Dongli Development Estate (东丽开发区) in the eastern (or make that southeastern, rather) suburbs of the city. The route will run through mostly suburban and newly-developed parts of town, including the Cultural Centre, New Badali Estate, Chentang Technology Service Estate, and industry estates. Interchanges are less visible here (only 2 are built as such), although amongst them is Lishui Road (澧水道) interchange with Line 8.
Construction will take the best part of 4 years, or in the case of Line 7, which tunnels through a lot of central urban Tianjin, 4 1/2 years.