Electronic devices for use in measuring surface friction on railroad tracks; electric monitoring railway traffic safety appliances; sensors, transmitters and microprocessors which detect, analyze and report the temperature, stress and related properties in an installed railway track and its environs

'analyz':24 'applianc':17 'detect':23 'devic':2 'electr':12 'electron':1 'environ':40 'friction':8 'instal':35 'measur':6 'microprocessor':21 'monitor':13 'properti':32 'railroad':10 'railway':14,36 'relat':31 'report':26 'safeti':16 'sensor':18 'stress':29 'surfac':7 'temperatur':28 'track':11,37 'traffic':15 'transmitt':19 'use':4

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