. The railroad and engineering journal . onsconnected with railroad location, and upon the judicioussolution of the many problems to which it gives rise andwhich have been explained in detail in the foregoing pages,depends to a great extent the future success of the road. On the finished profile should be shown clearly, by meansof notes, the class and dimension of every culvert, bridge,trestle, etc., that will be built on the line. Every gradeshould have marked on it the rate of grade, and the pointswhere the rate of grade changes should be clearly indi-cated. Along the top of the profile shou
. The railroad and engineering journal . onsconnected with railroad location, and upon the judicioussolution of the many problems to which it gives rise andwhich have been explained in detail in the foregoing pages,depends to a great extent the future success of the road. On the finished profile should be shown clearly, by meansof notes, the class and dimension of every culvert, bridge,trestle, etc., that will be built on the line. Every gradeshould have marked on it the rate of grade, and the pointswhere the rate of grade changes should be clearly indi-cated. Along the top of the profile should be indicated thealignment, showing at a glance the P. and P. andalso the direction of the curves, whether to the right or left,as we face in the direction in which the line is being every cut or fill the material of which it is composedshould be noted with as much exactness as possible. Whenthe profiles are finished by the engineer in charge of thework of construction, or for his use, it is often convenient Plate: lvii. line in its minor details will not fit in every case to theground, and where it is possible or probable that a betterline can be obtained, trials of different lines should bemade in the field, and the line accurately fitted in everydetail. As this final line is run in stakes should be drivenin at every station, and a plug with a tack point put in atevery P. C, P. C. C. and P. T., and as often on tangentsand curves as is necessary in order to always have visiblefrom any tack point, one other in each direction that mayserve as back-sight or fore-sight. All of these plugs should be carefully tied in, as explainedin Chapter X, care being taken to select the trees or otherobjects to which these points are tied, at a sufficient dis-tance from the center line, that there will be no danger oftheir removal, when the line is cleared for construction. By closely following the above advice, putting in plentyof plugs and carefully tying them, much time and
Size: 2378px × 1051px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1880, bookidrailroadengi, bookyear1887
