Beijing Subway rolling stock
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All Beijing Subway trains run on 1,435 mm (4 ft 8+1⁄2 in) standard gauge rail and draw power from the 750 V DC third rail, except those on Lines 6, 11 14, 16, 17 and 19, which use 1,500 V DC overhead wires.[1] Lines 6, 15, Fangshan, and Changping lines have a designed maximum service speed of 100 km/h (62 mph).[2] The Airport Line is linear motor driven with a designed maximum service speed of 110 km/h (68 mph)[3][4] All other Lines have a maximum service speed of 80 km/h (50 mph). Currently, Lines 1, 2, 4, 5, 8, 9, 10, 13, 15, Batong, Daxing, Changping, Fangshan, Yanfang, and Yizhuang lines use 6 car B size trains. Initially, the Batong line and Line 13 was originally used 4 car trains and now expanded into six.[5][6][7]