. Electric railway journal . Grade 2% 4% 5% 225 155 90 70 270 185 135 105 85 360 245 180 140 115 450 310 230 180 140 540 370 270 210 170 630 430 320 250 200 720 490 365 280 230 810 550 410 320 255 900 615 455 355 285 March 1, 1919 Electric Railway Journal 405. INTERURBAN FREIGHT TRAILER USED IN DETROITUNITED INTERLINE SERVICE W = Locomotive weight (tons) on == All resistance acting on locomotive, in poundsper ton. T = Weight of trailing load (tons).R = All resistance acting on trailing load, in pounds,per ton. P = Assumed percentage of adhesion. (a) P(2000)W — LW = TR (b) W = (2000 P
. Electric railway journal . Grade 2% 4% 5% 225 155 90 70 270 185 135 105 85 360 245 180 140 115 450 310 230 180 140 540 370 270 210 170 630 430 320 250 200 720 490 365 280 230 810 550 410 320 255 900 615 455 355 285 March 1, 1919 Electric Railway Journal 405. INTERURBAN FREIGHT TRAILER USED IN DETROITUNITED INTERLINE SERVICE W = Locomotive weight (tons) on == All resistance acting on locomotive, in poundsper ton. T = Weight of trailing load (tons).R = All resistance acting on trailing load, in pounds,per ton. P = Assumed percentage of adhesion. (a) P(2000)W — LW = TR (b) W = (2000 P-L) The adhesion of the driving wheels is variable, de-pending upon the weight of the rail, weather conditions,air surface of rail, etc. Adhesion frequently is 25per cent of the weight of the locomotive when runningand about 33 per cent of the weight of the locomotivewhen starting. On long grades, these figures may bereduced to 22 per cent for running and 27 per cent forstarting. In the use of these percentages for adhesion,the total tractive effort for train and locomotive is em-ployed and not the ratio of drawbar pull to locomotiveweight on drivers, the latter practice being commonlyfollowed in rating locomotives. As an example: What is the minimum
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