. Electric railway journal . e limits set by past experience. Influence of the Single Truck It might well be remarked here, however, that thefactor of headway becomes increasingly importantas the population of the locality that is served be-comes less, and hence the advantages of the large carbody has a decreasing value. When extreme condi-tions obtain, the single truck becomes a feature ofdecided importance, because its economies may besufficient to turn the scaleagainst the use of a large carbody, and thus warrant theuse of a smaller body thatcan be mounted on fourwheels. Assuming good track
. Electric railway journal . e limits set by past experience. Influence of the Single Truck It might well be remarked here, however, that thefactor of headway becomes increasingly importantas the population of the locality that is served be-comes less, and hence the advantages of the large carbody has a decreasing value. When extreme condi-tions obtain, the single truck becomes a feature ofdecided importance, because its economies may besufficient to turn the scaleagainst the use of a large carbody, and thus warrant theuse of a smaller body thatcan be mounted on fourwheels. Assuming good track,there appears to be no ques-tion that the single-truckcar (within its physical lim-itations) would be invariablypreferred to the double-truckdesign. The reasons beginwith reduced first cost,which has been found in thecase of some single-truckcars to be as low as two-thirds of the cost of smalldouble-truck designs of equalseating capacity. In the sec-ond place the weight is less, 590 ) ELECTRIC RAILWAY JOURNAL [ Car Capacity. the difference in favor of a singletruck for a design approximately35 ft. in over-all length being ofthe order of 3 tons. Finally, thereis a reduction in maintenance costbecause there are fewer wheelsand axles to maintain as well asonly about half the number oftruck parts, brakeshoes, journalbearings, trolley bases and thelike. The absolute maximum of car-body length that appears to bepermissible with a single truck is 35 ft. and mostof the recent single-truck cars are even slightlyshorter than this. Therefore, when circumstancesfavor the use of a car that is appreciably lessthan 45 ft. long it is obviously desirable to skipintermediate sizes and go to a body length of 35ft., thus permitting the use of a single , of course, the general rule of using thelargest body is upset, in the main, but the rulesinfluence appears, nevertheless, in the obvious exist-ence of a marked tendency to use, with single-truckcars, the largest body that can be mounted
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