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Colleagues,Stuart Thurstan (Weevil) published in the library, a very helpful chart of gradients to use when track laying. For the newbies, the numbers you see in the little elevation window are not percentage of grade, rather they are ANGLE OF GRADE. Since I am about to start a new project, I decided to increase the content of the original document, and include some common values of US grades, as well as the grades that will be found in the "Hook_Eye", which won't have a hook - it is long gone, but will have the "EYE". It is essentailly a 50 mile long switching lead to a Chemical complex, now closed, located in CopperHill, TN.Here then is the gradient chart. You can copy & past this into your favorite editor for keeps, and we will save some on library space.J. H. SullivanGrade Gradient MSTS Angle ____________________________________________________ .025% 1 in 4000 0.014 .050% 1 in 2000 0.028 .075% 1 in 1333 0.045 .090% 1 in 1160 0.050 .100% 1 in 1000 0.058 .125% 1 in 800 0.072 .150% 1 in 667 0.085 .175% 1 in 571 0.100 .180% 1 in 570 0.102 .200% 1 in 500 0.116 .220% 1 in 455 0.125 .240% 1 in 417 0.135 .250% 1 in 400 0.147 .260% 1 in 380 0.150 .280% 1 in 357 0.162 .300% 1 in 333 0.173 .325% 1 in 308 0.187 .350% 1 in 287 0.200 .375% 1 in 267 0.215 .400% 1 in 250 0.231 .425% 1 in 235 0.243 .450% 1 in 222 0.258 .475% 1 in 210 0.272 .500% 1 in 200 0.285 .520% 1 in 190 0.297 .525% 1 in 190 0.300 .550% 1 in 182 0.315 .575% 1 in 174 0.329 .600% 1 in 167 0.343 .625% 1 in 160 0.358 .650% 1 in 154 0.373 .675% 1 in 148 0.387 .700% 1 in 143 0.401 .725% 1 in 138 0.417 .750% 1 in 133 0.431 .775% 1 in 129 0.441 .790% 1 in 127 0.450 .800% 1 in 125 0.458 .825% 1 in 121 0.472 .850% 1 in 118 0.485 .875% 1 in 114 0.501 .900% 1 in 111 0.515 .925% 1 in 108 0.529 .950% 1 in 105 0.545 .975% 1 in 103 0.562 1.00% 1 in 100 0.575 1.05% 1 in 96 0.600 1.10% 1 in 91 0.633 1.15% 1 in 87 0.658 1.20% 1 in 83 0.698 1.25% 1 in 80 0.717 1.31% 1 in 76 0.750 1.45% 1 in 69 0.833 1.50% 1 in 67 0.860 1.57% 1 in 64 0.900 1.70% 1 in 59 0.975 1.85% 1 in 54 1.050 2.00% 1 in 50 1.150 2.09% 1 in 48 1.200 2.25% 1 in 44 1.290 2.50% 1 in 40 1.433 2.62% 1 in 38 1.500 2.75% 1 in 36 1.575 3.00% 1 in 33 1.733 3.14% 1 in 32 1.800 3.20% 1 in 31 1.833 3.40% 1 in 29 1.950 3.50% 1 in 28 2.030 3.66% 1 in 27 2.100 3.80% 1 in 26 2.183 4.00% 1 in 25 2.300 4.19% 1 in 24 2.400 4.35% 1 in 23 2.491 4.50% 1 in 22 2.583 4.71% 1 in 21 2.700 5.00% 1 in 20 2.870 5.23% 1 in 19 3.000
hehe, I just realized we are working on the same route...I've been working on the Georgia Northeastern RR (Elizabeth, Ga to Copper Hill) route. I never caught that you mentioned Hook and Eye till now. Pete Willard http://www.trainsimstuff.com
There is a file in the Utilities section of the file library, I think its name is tscalc.zip, by Bob Wirth, that has calculators that run in a DOS window while you're working in the RE. They translate vertical gradients as well as curvature. Very handy.I recently extracted a swatch of earth to represent the NEC's approach to New York City. DEMEX'd the terrain, 'dug' the tunnel (or 2 tunnels) into Bergen Hill using track chart info and these calculators, and when I got to the indicated deepest part of the tunnel under the Hudson River, I was within 4 feet of the known subelevation of the tunnel floor under the river. About 80 feet under mean low water. The gradients range from 0.4% to 1.9% in the tunnel which is about 2.5 miles long. Trains have to maintain 60MPH in the tunnels.Regards, Hank
If anybody wants to know the formula here it is:G is grade in percent A is angle of grade in degreesA = ARCSIN(G/100)G = 100*SIN(A)Some might argue that the ARCSIN and SIN be replaced with ARCTAN and TAN, but the difference is very minor (a couple thousandths of a degree).The excellent MSTS utility called "Poker" does this conversion and several others as well.Mark
Moffat Road Tabernash to Phippsburg All track complete Currently working on Mtracks
