signalman
noun
                                                                                                                            
                                                            sig·nal·man
                    
                                                                                                              
                                                                                                                                  ˈsig-nᵊl-mən 
                                                                                                                              
            -ˌman
                                                      
                                                          
                                
              
          
                                                      : a person who signals or works with signals (as on a railway)                                      
                
                    
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  Merriam-Webster unabridged




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