(3). Works director editing equipment maintenance power system to drive the train (ocs: overhead catenary system) and ds (disconnecting switch) on major routes, and also in the maintenance center.
(3) further work equipment maintenance. cut electric power systems to propel trains system (OCS: Overhead Catenary System), DS (Disconnecting Switch) on the main path and, as well as in maintenance.
(3) The facilities maintenance work Editing equipment electrical system is to drive subway system (OCS: Overhead Catenary System), a DS (Disconnecting Switch) in the route and home as well as in the center maintenance