A three digit number consisting of the same number. Example; 111.
                                                            
                                                     
                        
                                                
                        
                        
                            A set of three 28-foot trailers, connected with two converter dollies, used to transport LTL freight.
                                                            
                                                     
                        
                                                
                        
                        
                            Tractor towing three trailers. The combination is usually made up of components similar to A Train DOUBLE. see DOUBLES.