802 THE BELL SYSTEM TECHNICAL JOURNAL, MARCH, 1954 



this, as we have seen, will come a marked increase in the speed of move- 

 ment of toll traffic. 



The third and final phase of transition toward the ultimate goal now in 

 its infancy, will in^'ol^•e progressive introduction of customer diaUng of 

 all toll traffic. Whereas, for operator toll dialing a high-speed trunking 

 S3'stem is desirable, for customer toll dialing it is a firm reciuirement. 

 Thus engineered alternate routing, which is the basis of the most eco- 

 nomical and effective arrangements of toll plant facilities thus far con- 

 ceived for highspeed trunking, will be indispensable to the further de- 

 velopment of customer toll dialing. 



There is little doubt that the unsolved problems of the moment will be 

 resolved if not by statistical methods then by the empirical approach 

 which has helped to find the answer to some telephone problems of 

 the past. In the meantime, those who have been intimately associated 

 with the project of nationwide toll dialing through these pioneering years 

 ha^'e faith that the present plans and methods, revised as circumstances 

 and experience may indicate, will result in the ultimate achievement of a 

 toll service which will be fast, dependable and economical. 



