safety systems comprised of wireless transmitters and receivers for communicating locations of people and railway vehicles; wireless transmitters and receivers; devices for wireless radio transmission and reception; devices for alerting people of proximity of people and railway vehicles

'alert':30 'communic':10 'compris':3 'devic':21,28 'locat':11 'peopl':13,31,35 'proxim':33 'radio':24 'railway':15,37 'receiv':8,20 'recept':27 'safeti':1 'system':2 'transmiss':25 'transmitt':6,18 'vehicl':16,38 'wireless':5,17,23

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