Power supply.
        
        
          - 
            Law
          
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                CFR 49
              
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                Transportation
              
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                Other Regulations Relating to Transportation
              
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                Federal Railroad Administration, Department of Transportation
              
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                Rules, Standards, and Instructions Governing the Installation, Inspection, Maintenance, and Repair of Signal and Train Control Systems, Devices, and Appliances
              
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                Automatic Train Stop, Train Control and Cab Signal Systems
              
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                Standards
              
- Power supply.
            
  Automatic cab signal, train stop, or train control device hereafter installed shall operate from a separate or isolated power supply. 
  [49 FR 3386, Jan. 26, 1984] 
          
           
           
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