. Electric railway journal . le 500tons trailing load? Further assume that the nature of theroad is such as to be equivalent to a continuous pull up per cent grade. What is the minimum equipment fora locomotive if forced ventilation is used and the freerunning speed on the level is 12 ? The short-grade curve in Fig. 2 shows that a locomotivewill handle times its weight on the maximum continuous forced-ventilation curve of Fig. 2 showsthat on a per cent grade the locomotive will haul its own weight. Hence the short 2 per cent gradefixes the locomotive wei
. Electric railway journal . le 500tons trailing load? Further assume that the nature of theroad is such as to be equivalent to a continuous pull up per cent grade. What is the minimum equipment fora locomotive if forced ventilation is used and the freerunning speed on the level is 12 ? The short-grade curve in Fig. 2 shows that a locomotivewill handle times its weight on the maximum continuous forced-ventilation curve of Fig. 2 showsthat on a per cent grade the locomotive will haul its own weight. Hence the short 2 per cent gradefixes the locomotive weight, and this should be not lessthan 500 -f- = 52 tons. Fig. 4 shows that at 12 ,with forced ventilation, the minimum equipment shouldhave hp per ton. Hence the locomotive should X 52 = 395 hp. The equipment should be four 100-hp Wo 1*1 / fy Jt 7 $ 20 IS . 16c o *14ua. S 12 5o I* 10 u o W 8E3 | 6c a 420 MinirTon= num ! iorseMiles poweper 1 • per[our. 5 10 15 Miles per Hour Rated Speed. 10 15 20 25. Miles per Hour Rated Speed. Fig. 3—Curve Showing Relation Be-tween Rated Speed and Free Run-ning Speed on the Level with Maxi-mum Weight of Train Fig. 4—Curve Showing MinimumRated Capacity in Horse-Power perTon of Any Locomotive at AnyRate of Soeed 5 10 15 20 25 Miles per Hour Free Running Speed Fig. 5—Curves Showing Cur-rent Required by Locomotivefor Any Free Running Speedon Various Grades blowers are used. The curve on Fig. 2 for continuousnatural ventilation shows that on a perfectly level gradethe locomotive will haul eleven times its own weight, or 313tons. Hence in this case the short 2 per cent grade is thefeature limiting the tonnage. To find the speed runningfree on the level with the maximum tonnage use Fig. shows 17 Case II. Suppose the road is not practically level but isin a rolling country, and that, in addition to the short 2per cent grades, there are a number of grades of percent, each from 2 miles to miles in l
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