. Official proceedings . 19 21 23 Aac m Years Figure 8 1930 and 1931, but the trend line which was made up from thefour years shown, may be a fair trend of maintenance should, however, be used with caution due to the rapidlychanging conditions. Figure li» shows a record with repair costs under good con-trol. The cost records of this jjarticular road show in all re-spects a well determined trend, and the trend can be confitlentlyused for future costs. 52 The s])otting of a years performance on a trend line con-sists of two calculations—The cost ])er Horse Power Unit is thetotal cost of
. Official proceedings . 19 21 23 Aac m Years Figure 8 1930 and 1931, but the trend line which was made up from thefour years shown, may be a fair trend of maintenance should, however, be used with caution due to the rapidlychanging conditions. Figure li» shows a record with repair costs under good con-trol. The cost records of this jjarticular road show in all re-spects a well determined trend, and the trend can be confitlentlyused for future costs. 52 The s])otting of a years performance on a trend line con-sists of two calculations—The cost ])er Horse Power Unit is thetotal cost of rei)airs divided by the Horse Power Unit per-formance. The age of use is obtained l)y dividing the sum ofthe products of Horse Power Units ])y each year of age bythe total Horse Power 19 21 23 Age in Years Figure 9 In our discussion of repair costs so far we have referredto trunk line roads. The term has been used advisedly as wehave found that the costs on so-called switching lines are con-siderably higher than on the larger roads. This is due to thefollowing reasons: Less volume of work for necessary total shop equipment. Short engine runs. S3 Figure 11 shows a number of switch road trend lines. Youwill note that these trends or cost curves do n(jt have any greatdivergence from each other and a combined curve would l)erepresentative of this type of road. A\e show such a combinedcurve in Figure 13.
Size: 1742px × 1434px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookidofficialproc, bookyear1901
