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While working on my route I started laying track and was trying to get my grades accurate with my track chart. After a couple of miles I relized that my track was diging way too far in to the ground for such a gentle slope. I then realized that puting in the number of the grade on the track chart(highlited in the picture)isnt the same value that needs to go in the elevation box in the RE while rotating the section of track. Obviously there is some conversion I need to do. I tried reading my copy of Michael Vonne's guide to route building, but the paragraph about sloping the track made me more confused. (Paragraph 3.3.6 to be exact) What I need to know is, how do I convert the number on my track chart to a number that can be utilized in RE? Thanks
Ahh.. This is what I was looking for. I know there had to be some way to do this with a calculator. Now hopefully my grades wont be as far off... Thanks for the help...
There is one more thing to be aware of:Most track charts do not give the absolute elevation above sea level. I am lucky in that the Milwaukee Road did this, the Northern Pacific & CSX did not, but old Clinchfield profiles do have a graph at the bottom that can be used.I suggest that you download UsaPhotomaps (free) from Jdmcox.com and use it to download topo. maps (and aerials where available). Use the aerials to digitize waypoint markers to get the C/L as accurate as you can, and try to get the elevation as often as you can, remembering that the topo. map generally does not account for man made hills and valleys as it were, as well as natural ones.J. H. Sullivan
Then again, it does appear that your profile has those elevations. If so, take them as GOSPEL, although if you use the seamless USGS data & DEMEX to extract your terrain, you may have to offset it one way or another, or up & down to get a close match. Just try for a close match at one point, preferably near the middle of the route.J. H. Sullivan
