radios; radio frequency transceivers for controlling, transmitting, receiving, and routing wireless messages and data; radios used for positive train control operations; wireless communication devices used for receiving and transmitting messages in a positive train control system; wireless communication devices used for receiving and transmitting messages in a interoperable train control 220 MHz network

'220':51 'communic':23,38 'control':6,20,35,50 'data':14 'devic':24,39 'frequenc':3 'interoper':48 'messag':12,30,45 'mhz':52 'network':53 'oper':21 'posit':18,33 'radio':1,2,15 'receiv':8,27,42 'rout':10 'system':36 'train':19,34,49 'transceiv':4 'transmit':7,29,44 'use':16,25,40 'wireless':11,22,37

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