The TADS is installed on the mainline and adopts advanced trackside acoustic tracking technology and intelligent identification technology to carry out early diagnosis and hierarchical alarm for cracks, peeling, wear and corrosion of inner and outer rings of bearings and rolling elements of various types of railway trains. The TADS is applicable to the on-line dynamic detection of all types of EMUs, locomotives, vehicles and push-pull train, and meets the relevant requirements of railway industry standards.