Signal, block.
        
        
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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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                Definitions
              
 
              - Signal, block.
 
        
        
        
        
          
            
  A roadway signal operated either automatically or manually at the entrance to a block. 
          
           
           
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