. Official proceedings . 85,76089,03492,30895,58298,856 102,130105,404108,678111,952115,226 118,500121,774125,048128,32;? TotalCost ofOpera-tion Iotal Yearly Average $243,946269,676279,308283,666285,928 289,103291,333293,632295,896298,164 300,430302,692304,958307,224309,490 311,753314,019316,285318,551320,813 $5,936,867$2%,843 Figure 24 70 economic life of power and the purchase of new power at theexpiration of this economic life will show a tremendous effecton the total operating expense of the road. There is also in-dicated the increase in net income that can be accomplished bya caref
. Official proceedings . 85,76089,03492,30895,58298,856 102,130105,404108,678111,952115,226 118,500121,774125,048128,32;? TotalCost ofOpera-tion Iotal Yearly Average $243,946269,676279,308283,666285,928 289,103291,333293,632295,896298,164 300,430302,692304,958307,224309,490 311,753314,019316,285318,551320,813 $5,936,867$2%,843 Figure 24 70 economic life of power and the purchase of new power at theexpiration of this economic life will show a tremendous effecton the total operating expense of the road. There is also in-dicated the increase in net income that can be accomplished bya careful analysis of the operating costs and capital chargesnivolved in locomotive performance. It must be understood thatthe curve, as shown in Figure 23, covers only the particularcase that we have been discussing. However, the economic lifeof any fleet of locomotives can be predetermined providing thetrend of the cost of repairs of the road has been two factors that determine the economic life are first, the. 15 20 25 Years of Service. Figure 25 71 trend of the cost of repairs by year of age, and second, the aver-age miles per year that the locomotives operate. This economiclife will be shorter as the rate of cost of repairs by year of ageincreases and as the average locomotive miles per year would indicate that the most economic method is to selectpower suitable for the service required and obtain the maximummileage in the minimum time. The tabulation, Figure 24, shows the calculations for atwenty year life as plotted on Figure 23. The calculations forall other years were obtained in the same manner. The relative efifect of the various factors making up theaverage total cost of operation is shown very clearly whenplotted. Such a plot is shown in Figure 25. Starting at the top, we have the sum of the constant costs,which comprises the greatest single element. These constantcosts include crews wages, fuel, lubrication, other supplies,water and engineho
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