Beijing's subway lines generally follow the checkerboard layout of the city. Most lines run parallel or perpendicular to each other and intersect at right angles.
Line 1
a straight east-west line underneath Chang'an Avenue, which bisects the city through Tiananmen Square. Line 1 connects major commercial centres, Xidan, Wangfujing, Dongdan and the Beijing CBD.
Line 2
A rectangular loop line, traces the Ming-era city wall that once surrounded the inner city, and stops at 11 of the wall's former gates (ending in men), now busy intersections, as well as the Beijing Railway Station.
Line 4
a mainly north-south line running west of city centre with stops at the Summer Palace, Old Summer Palace, Peking and Renmin Universities, Zhongguancun Technology Park, National Library, Beijing Zoo, Xidan and Beijing South Railway Station.
Line 5
A straight north-south line just east of the city centre. It passes the Temple of Earth, Lama Temple and the Temple of Heaven.
Line 8
Phase I (Olympic Branch Line) extends north off Line 10 with three stops in the Olympic Green.
Line 10
An inverted L-shaped shaped route to the north and east of Line 2. It runs east-west, following the Yuan-era city wall in the north, passing just south of the Olympic Green and turns south at Sanyuanqiao, northeast of the city, and follows the eastern 3rd Ring Road through the embassy district and Beijing CBD.
Line 13
arcs across suburbs north of the city and channels commuters to Xizhimen and Dongzhimen, at the northwest and northeast corners of Line 2.
Line 15
branches off Line 13 at Wangjing West and runs northeast to suburban Shunyi District.
Batong Line
extends Line 1 eastward from Sihui to suburban Tongzhou District.
Changping Line
branches off Line 13 at Xi'erqi and runs north to suburban Changping District.
Daxing Line
extends Line 4 south to suburban Daxing District.
Fangshan Line
It is currently a stand alone line in southwest Beijing that connects Dabaotai in Fengtai District with suburban Fangshan District. It will be linked to the subway network with the completion of Line 9 in 2012.
Yizhuang Line
extends from Line 5's southern terminus to the Yizhuang Economic & Technological Development Zone in the southeastern suburbs.
Airport Express
It connects the Beijing Capital International Airport, 27 km northeast of the city, with Line 10 at Sanyuanqiao and Lines 2 and 13 at Dongzhimen.
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