. . "Beijing Subway" . . . . . . . "463" . "Beijing" . "Beijing metro" . . "14" . . . . . . "1971-01-15" . "Future expansion" . . . . . "3848400000" . "Beijing Subway#Operators" . . . . . . "Subway" . . "750.0" . . "six subway lines" . "Beijing's subway" . . . . . . . . . . "Beijing underground" . . "25" . . "6173" . . . . . . . "Beijing_Subway#Owner_and_operators" . . . . . . "subway network" . . . . . . . . . . "Beijing_Subway" . "first subway in China" . . . . "subway system" . "11" . . . . . . . . "Beijing Subway" . "longest" . . "Beijing Subway#Monorail" . . "1971" . . . "subway" . . . . . . . .