It is indispensable to perform maintenance of bogies of railway vehicles in order to achieve their safety and stable running condition. In current maintenance activities, the bogies are inspected by time-based maintenance. In recent years, however, condition-based maintenance is increasingly being introduced as a means of preventive maintenance of the bogie components such as axle journal rolling bearings and wheels, etc. The article describes an overview of these two condition monitoring techniques with various sensors for the bogie: on-board monitoring techniques and trackside monitoring techniques. The former includes irreversibility temperature indicators on the endcap of axle bearings, axle bearings equipped with temperature sensors and accelerometers, and a bogie condition monitoring with accelerometers. The latter includes wheel flat detections, overheated axle bearing detections, train fire detections and acoustic detections of defective bearings.
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