Electronic monitoring of the movement of objects around railroad tracks, highway grade crossings, passenger stations, railroad bridges and railroad tunnels, and electronic reporting to train conductors and railroad operations personnel of hazards detected, all by means of computers and sensors

'around':8 'bridg':17 'comput':38 'conductor':26 'cross':13 'detect':33 'electron':1,22 'grade':12 'hazard':32 'highway':11 'mean':36 'monitor':2 'movement':5 'object':7 'oper':29 'passeng':14 'personnel':30 'railroad':9,16,19,28 'report':23 'sensor':40 'station':15 'track':10 'train':25 'tunnel':20

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