by detecting or indicating heat radiation from overheated axles

Full Title

Railway vehicle profile gauges; Detecting or indicating overheating of components; Apparatus on locomotives or cars to indicate bad track sections; General design of track recording vehicles > Detectors for indicating the overheating of axle bearings and the like, e.g. associated with the brake system for applying the brakes in case of a fault > by detecting or indicating heat radiation from overheated axles