. Railway mechanical engineer . al delays 1 hr. 0 min. 2,000 (3 -\ ) = 470 lb. 3. Grade = O Sum of friction and grade resistances = 3,170 tractive effort = 60,900 — 3,170 = 57,730 a three per cent equivalent grade at this speed, re-sistances 1 and 2 are the same as for level tangent track, but: 484,000 3. Grade = x 20 x 3 = lb., and the 2,000total friction and grade resistance = 17,370 lb. Available tractive effort = 60,900 — 17,370 = 43,530 lb. Plotting these two points on a chart. Fig. 3, and connect-ing them by a straight line, gives the available tractive eff
. Railway mechanical engineer . al delays 1 hr. 0 min. 2,000 (3 -\ ) = 470 lb. 3. Grade = O Sum of friction and grade resistances = 3,170 tractive effort = 60,900 — 3,170 = 57,730 a three per cent equivalent grade at this speed, re-sistances 1 and 2 are the same as for level tangent track, but: 484,000 3. Grade = x 20 x 3 = lb., and the 2,000total friction and grade resistance = 17,370 lb. Available tractive effort = 60,900 — 17,370 = 43,530 lb. Plotting these two points on a chart. Fig. 3, and connect-ing them by a straight line, gives the available tractive effortover equivalent grades up to three per cent for locomotiveClass S-4, at speeds below miles per hour. Using thesame formulae, available tractive effort curves for speeds ofsix, seven, eight, nine and ten miles an hour are curves give complete available tractive effort data forClass S-4 locomotives. The same process is followed for thevarious classes of locomotives to be used, and these charts, • 40,000 i- ^ Fig. Ruling Grade, PerCen-l: -Available Tractive Effort for Two Typical LocomotivesUnder Various Conditions of Speed and Grade Taking water and other road delays . .. .0 hr. 45 miaTime left for making run witliin the eight hours 6 hrs. 15 min Length of division 93 miles Average speed over division I63/2 Nortlibound, the AB division has 46 miles of heavy ascend-ing grade, 37 miles of low descending grade and 10 miles oflevel road. The descending grade and level portion can becovered in approximately one hour and 45 minutes, leavingfour hours and 30 minutes to cover the 46 miles of ascend-ing grade, over which tlie average speed will, accordingly,be slightly more than 10 miles per hour. This average speed a 00 aoo 600 ^ SOO 400 300 ZOO 100
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
