. Electric railway journal . these tests twenty of the most importantlines were chosen as being repre-sentative of the entire system,and a traffic survey was made ofthese lines. In tabulating the re-sults for the summarized datarecord, each line was divided intosections and the data have beentabulated for each section. Bythis method we have been able todetermine accurately the servicecharacteristics of the various dis-tricts as well as the requirementsfor the complete line. A compari-son of the results of these tests indicates that this serv-ice in most cases is made up of four distinct classe
. Electric railway journal . these tests twenty of the most importantlines were chosen as being repre-sentative of the entire system,and a traffic survey was made ofthese lines. In tabulating the re-sults for the summarized datarecord, each line was divided intosections and the data have beentabulated for each section. Bythis method we have been able todetermine accurately the servicecharacteristics of the various dis-tricts as well as the requirementsfor the complete line. A compari-son of the results of these tests indicates that this serv-ice in most cases is made up of four distinct classes asfollows: 1. At the ends of the lines there are runs of fromli to 2A miles in length through a suburban districtwhere the stops average from five to six per stops are of comparatively short duration dueto the small number of persons boarding and alightingat each stop. 2. Another class of service is through a more closelypopulated residence section with stops of from seven 1 By C. IV. Squier Electrical Engineer. The first essential in motor selection is accurate knowledge of car operation. to nine per mile, with some transfer points and with acorrespondingly longer time for stops. 3. The next class is operation through a businesssection where the stops average from twelve to sixteenper mile and where the headway betwen cars is soshort, due to several lines operating over the sametracks, that there is very little operation beyond theseries position of the controller. Frequent slow-downsfor traffic also add somewhat to the congestion. 4. The last class of service involves entering andoperating across bridges which have severe grades ateach end and where the only stops are due to conges-tion of traffic. The length of these runs is from 1 toli miles in each direction. In the following Traffic Data Record I have shownthis summarized record for fourof these lines. This will illustratehow the data were separated foreach line so as to show averageresults for each class of
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