. Electric railway journal . f these cases high speed is not necessary, andan electric railway already equipped for the operation ofpassenger trains of only one or two cars has ample capacityto operate freight trains of fairly large tonnage at lowspeed. Such traffic can best be cared for during the hoursof light passenger service and at night when no othertrains are on the line. Interest on the investment for thepower house, substations and distributing system is goingon all the time. With the established record of electricalapparatus for reliability an interurban road may operate twenty-four
. Electric railway journal . f these cases high speed is not necessary, andan electric railway already equipped for the operation ofpassenger trains of only one or two cars has ample capacityto operate freight trains of fairly large tonnage at lowspeed. Such traffic can best be cared for during the hoursof light passenger service and at night when no othertrains are on the line. Interest on the investment for thepower house, substations and distributing system is goingon all the time. With the established record of electricalapparatus for reliability an interurban road may operate twenty-four hours a day as well as eighteen hours or twentyhours and move traffic which it cannot at present handlein the shorter time because of lack of track capacity andlimitations in the power equipment and distributing extra expense for station attendance, power and wearand tear on the machinery, and, of course, the cost of loco-motive crews, would be covered by the receipts from a com-paratively small amount of 01 1 1 1 1 1 1 1 1 1 1 1 I 0 10 20 30 40 50 60 Rated Horsepower ~ Miles per Hour Rated Speed Or Tractive Effort -~ 375 Electric Ry. Journal Fig. i—Electric Locomotives—Curve Showing MaximumWeight of Locomotives for Any Capacity at AnyRated Speed for Any Rated Tractive Power ENGINEERING CONSIDERATIONS Granting that a carload freight business is offered or canbe built up readily, the railway manager must determinethe probable size of trains to be handled, decide upon thespeed at which they are to operate and see that the locomo-tives best adapted to all his conditions are secured. Thecharacteristics of the track, curvature, grades, rail weight,strength of bridges, etc., must be considered. The maxi-
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