A sensor system IS described that monitors a radway waggon on-hne m terms of the stram ai%ctmg its chasms and rts freight Makmg use of standard rnicmntroller techmques, it Interrogates sensors detecting tierent physical parameters, correlates the received data, mltmtes acbons and communicates remotely urlth stationary control equipment The incorporation of a novel SAW component ('ID-tag') wdl allow vehde ldentli%catlon and wreless alarm calling. As an example, an acceleration measurement has been mcorporated, from wluch the velocity of colbdmg waggons m shuntmg events IS denved Wth the waggon coming to a standstill after the colhslon, the evaluation algorithm,, workmg from threshold tnggenng and short-term signal integration, gves the speed of approach duectly Practical tests at a tram-shuntmg track have proved the sensor system to be more versatde and accurate than standard pendulum sensors Mechantcal low-pass filtenng by soft suspension of the acceleration sensing devxe was found to be useful for suppression of local waggon-body oscdlafions, wluch do not contriiute to the centeraf-grav@ motion but take a lot of the acceleration signal headroom