. American engineer and railroad journal . ances, as the wind, gra-dients, curves, journal and rolling friction on rails. No. 11, one of the through trains leaving Grand Central Sta-tion with ten cars, is 809 feet long from tip of pilot to rearof buffer, the average weight being 650 tons. With eleven carsthe length is 880 feet, one-sixth of a mile, quite as long andmuch heavier than the slow freight trains twenty years ago. The stored energy in foot-pounds required for a 650-ton pas-senger train at various speeds, including 10 per cent, of rota-tion of wheels, is as follows: Speed In Foot-poun
. American engineer and railroad journal . ances, as the wind, gra-dients, curves, journal and rolling friction on rails. No. 11, one of the through trains leaving Grand Central Sta-tion with ten cars, is 809 feet long from tip of pilot to rearof buffer, the average weight being 650 tons. With eleven carsthe length is 880 feet, one-sixth of a mile, quite as long andmuch heavier than the slow freight trains twenty years ago. The stored energy in foot-pounds required for a 650-ton pas-senger train at various speeds, including 10 per cent, of rota-tion of wheels, is as follows: Speed In Foot-pounds Stored Miles per Hour. Energy Required. Difference. 10 4,776,200 4,776,200 20 19,162,000 13, 30 43,043,000 23,881,000 40 76,505,000 33,462,000 45 96,811,000 20,306,000 50 ,000 22,737,000 65 144,573,000 25,025,000 60 172,172,000 27,599,000 The locomotives, so far as ordinary train resistance is con-cerned, would have no difficulty in maintaining the speed whenonce attained at 50, 55 or 60 miles per hour. To raise the train. An Improved Form of Piston Valve Packing. through the ring, the lugs serving to provide means for boltingthe joint so as to make the ring continuous as far as the steamis concerned. This packing ring is first turned up of largerdiameter than the bore of the bushing. The required amountis then cut out on a bevel across the ring and a shim of therequired thickness is inserted in the slot. The ring is thenclamped together by a bolt, with the shim, and accuratelyturned up to the proper size so that the outside is a true cir-cle. The use of the shim permits of adjustment to the properfit in the bushing and also makes it possible to provide forwear by putting in a thicker shim. This construction requires careful fitting of the bushing andit may be necessary to ream the bushing to accurately fit thevalve after the bushing is in place. Once accurately fitted thepacking ought to remain tight for a long time. This designseems to have the advantages of
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
