. Electric railway journal . re con-ducted by T. D. Yensen and W. A. Gatward. Theresults are presented in detail in Bulletin No. 95 ofthe Illinois Engineering Experiment Station, copies ofwhich may be obtained by addressing C. R. Richards,director, Urbana, 111. Off-Peak Tank Car Serviceat Boston THE advantages of off-peak electric freight trafficon a carload basis are well illustrated by a tank-car haulage service inaugurated in the latter part of1916 by the Boston Elevated Railway. This service con-sists of the transportation of molasses from CoppsHill Wharf, Boston, to the plant of the Purit
. Electric railway journal . re con-ducted by T. D. Yensen and W. A. Gatward. Theresults are presented in detail in Bulletin No. 95 ofthe Illinois Engineering Experiment Station, copies ofwhich may be obtained by addressing C. R. Richards,director, Urbana, 111. Off-Peak Tank Car Serviceat Boston THE advantages of off-peak electric freight trafficon a carload basis are well illustrated by a tank-car haulage service inaugurated in the latter part of1916 by the Boston Elevated Railway. This service con-sists of the transportation of molasses from CoppsHill Wharf, Boston, to the plant of the Purity Distil-ling Company in Cambridge, the product being hauledin tank cars of about 5000-gal. capacity owned by thedistilling company and built according to the specifica-tions of the railway company. The traffic is handledbetween the hours of 8 p. m. and midnight, which areentirely outside the peak-load period of the side-dump cars or snowplow motor cars areutilized as electric locomotives in this service with-. INCREASING THE SERVICE FACTOR OF ROLLING STOCK ON THEBOSTON ELEVATED out additional investment in rolling stock. The formerare used in winter and the latter in summer. Theaccompanying illustration shows a typical train unit. Molasses is received at Copps Hill Wharf in ship-loads, a berthing space 400 ft. long being molasses is pumped from the vessel into a storagetank of 1,500,000-gal. capacity and thence is pumpedinto the tank cars via a loading tank, the average timeof filling per car being about four minutes. A maximumof twelve tank cars have been filled, hauled to EastCambridge and emptied in one nights run, three mo-tor cars being required. The length of haul is about 2miles from terminal to terminal and about ten minutesare required to empty each car. The motor and tankcars are equipped with air brakes. Two men consti-tute the locomotive crew on each trip. The distilling company manufactures pure alcoholfor commercial purposes, and befo
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