railroad control systems consisting of control panels, wire based and radio based controllers, computers, printers, monitors, input/output devices, namely signal relays, signal converters, microprocessors, discrete inputs/outputs, track circuits, signal lamps, field detectors and crossing warning sensors and displays; switch machines; and computer software to control railroad systems

'base':9,12 'circuit':28 'comput':14,42 'consist':4 'control':2,6,13,45 'convert':23 'cross':34 'detector':32 'devic':18 'discret':25 'display':38 'field':31 'input/output':17 'inputs/outputs':26 'lamp':30 'machin':40 'microprocessor':24 'monitor':16 'name':19 'panel':7 'printer':15 'radio':11 'railroad':1,46 'relay':21 'sensor':36 'signal':20,22,29 'softwar':43 'switch':39 'system':3,47 'track':27 'warn':35 'wire':8

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