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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