Time locking.
        
        
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            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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                Interlocking
              
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                Inspection and Tests
              
- Time locking.
            
  Time locking shall be tested when placed in service and thereafter when modified, disarranged, or at least once every two years, whichever shall occur first. 
  [49 FR 3385, Jan. 26, 1984] 
          
           
           
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