Electronic railroad safety signals, namely active warning systems for railroad grade crossings for warning and communicating to vehicular traffic and pedestrians the presence of oncoming trains comprising of audible signals, visual signals, train crew notification signals, and vital detection units with digital input and output displays

'activ':6 'audibl':29 'communic':16 'compris':27 'crew':34 'cross':12 'detect':39 'digit':42 'display':46 'electron':1 'grade':11 'input':43 'name':5 'notif':35 'oncom':25 'output':45 'pedestrian':21 'presenc':23 'railroad':2,10 'safeti':3 'signal':4,30,32,36 'system':8 'traffic':19 'train':26,33 'unit':40 'vehicular':18 'visual':31 'vital':38 'warn':7,14

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