Beijing metro, China's first subway system, is in the service of Beijing urban rail transit system, By the end of 2012, Beijing metro had had an overall length of 442 km operating lines of rail transit system, with a total of 16 lines (15 subway lines, 1 airport rail), 262 operating stations, and 37 transfer stations.

　　ACETEC undertook the construction and maintenance of the public security 350 million wireless emergency command/communication system on Beijing metro lines.