. Electric railway journal . STANDARD TYPE OF CABOOSE USED ON THEFORT DODGE LINE approximately 15 being desired on the longgrade ? Consider the starting conditions first. From Fig. 3the train resistance is 5 lb. per ton, and the locomotiveresistance is 15 lb. per ton. The resistance of the 2per cent grade is 40 lb. per ton. Allow 10 lb. per tonfor acceleration. Then the starting drawbar pull is:(5 + 40 + 10) 1000 = 55,000 lb. Let the locomo-tive weight in tons be W and assume 33 per cent adhe-sion. Then or. ^ (2000) W — 55 W = 45,000 or 445 W = 45,000 and W = 101 tons. When starting on
. Electric railway journal . STANDARD TYPE OF CABOOSE USED ON THEFORT DODGE LINE approximately 15 being desired on the longgrade ? Consider the starting conditions first. From Fig. 3the train resistance is 5 lb. per ton, and the locomotiveresistance is 15 lb. per ton. The resistance of the 2per cent grade is 40 lb. per ton. Allow 10 lb. per tonfor acceleration. Then the starting drawbar pull is:(5 + 40 + 10) 1000 = 55,000 lb. Let the locomo-tive weight in tons be W and assume 33 per cent adhe-sion. Then or. ^ (2000) W — 55 W = 45,000 or 445 W = 45,000 and W = 101 tons. When starting on the long per cent grade at 27per cent adhesion, the drawbar pull is 45,000 lb. ~-Q (2000) W — 55 W = 45,000 or 485 W = 45,000 and W = tons. When running at 22 per cent adhesion, the draw-barpull is 35,000 lb., and 22 j^j (2000) W— 45 W = 35,000 or 395 W = 35,000 and W = tons. Hence, for this set of conditions, the running adhe-sion on the short 2 per cent maximum grade is the de-termining feature, and the
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