Complex sentence: Each train has a Train Management System (TMS) including equipment monitoring systems, communications, air-conditioning etc., and equipment control including Selective Door Operation (SDO); the SDO system uses GPS and train speed integration to estimate position.
Split into simpler sentences: Each train has a Train Management System (TMS) including equipment monitoring systems, communications, air-conditioning etc., and equipment control including Selective Door Operation (SDO). The SDO system uses GPS and train speed integration to estimate position.