Line 4 of the
Beijing Subway is the 9th subway line in
Beijing's
mass transit network. It entered into operation on September 28, 2009, and runs from north to south, parallel and to the west of
Line 5, through
Haidian,
Xicheng,
Xuanwu and
Fengtai Districts in the western half of the city. It is 28.2 km long with 24 stations. Riding on this line starts from a fare of
RMB(¥) 3.00 depending on the distance travelled. Line 4's color is
teal.