automatic and manual warning systems for use in railroad areas, consisting principally of sensors and interfaces to detect approaching trains, wired and wireless communication units, electric controllers, emergency warning lights and alarms and activators to effect the train movements

'activ':34 'alarm':32 'approach':19 'area':10 'automat':1 'communic':24 'consist':11 'control':27 'detect':18 'effect':36 'electr':26 'emerg':28 'interfac':16 'light':30 'manual':3 'movement':39 'princip':12 'railroad':9 'sensor':14 'system':5 'train':20,38 'unit':25 'use':7 'warn':4,29 'wire':21 'wireless':23

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