Tsre 5 grade
On your first point, while the majority of Britain was mapped by at least the 18th century, in places like the America's and Australia, the railways generally proceeded mapping so no distances where known.
How it was done was expalined to me by an old engineer/surveyor. I do not believe the thread was hijacked, the question of the distance as specfied on a railway is definitely something one needs to ask when doing a route, and in fact if the distance was a true horizontal distance or the actual track distance is something a had wondered about. Sorry, I didn't ,mean to highjack this thread. Considering how track might snake around in hilly terrain that explanation certainly makes perfect sense. Note 1: The length was measrured of all straights between the points when a curve ended and the next curve started, the length over curves was measured in 100metre or so sections.I assumed that the process would have started with a map, knowing horizontal distances. Incedently I have measured on Google earth the actual horizontal distance (Note 1) of the line Between Melbourne in Victoria Australia to Wagga in New South Wales, The rail distance i something around 450 kilmetres the measured distance varied by less than 300 metres, this corresponds to an error of around 0.06% an amount that would be insignificant in a route that long.
The error caused by the simplistic world model used by MSTS in most cases would produce an error greater then this error. Note : if you set up a route using markers taken from Google earth as long as one can set the grades correct th actual track distance should not really be an issue. As Goku has already mentioned the difference between the true track distance and the actual horizontal distance is not really significant. Due to this method of laying out the line only the distance the line actual covered would have been known, ie in hilly terrain horizontal distance would have had to be calcaulated. For important projects particularly over difficult terrain a number teams were used and the results compared to get greater accuracy. The line was laid out with a team of surveyors, pegging out the line using chains and a set of theodelites. When railways were laid out in the pre computor days, surely the horizontal distance would NOT have been known. That being said it is true that for the relatively shallow gradient to which railroad right of way must be maintained the error in any case will be very small.
The hypotenuse is a not really relevant unknown and calculating it is an additional unnecessary step. Alternatively, the horizontal distance needed to maintain a predetermined gradient is simply the rise divided by that gradient. These are the two meaningful dimensions and rise divided by horizontal dimension provides the percent of gradient. For a route builder the required vertical rise of the grade is a known as is the horizontal distance between the two points over which the rise occurs. The percent of gradient is then taken as the rise divided by the run. I do not claim any expertise in railroad terminology but in the architectural profession run is considered to be the horizontal dimension and rise the change in height. I'll be watching this project with a great deal of interest.
#Tsre 5 grade windows 10
(All it takes is basic trigonometry to shuttle back and forth.)īy the way, the recent Windows 10 "Anniversary Update" (1607) put the kuybosh on my use of the MSTS RE. So, without making a survey of how many in Case 1 and how many in Case 2, the important thing is for you to carefully and precisely define what "run" means for your editor. But for those of us who model inclined plane railroads, the distinction is important. Now, for typical railroad grades, the angle is small, and the sine, tangent, and angle (in radians) are approximately equal. The sine of the angle will be rise/run in the first case, and the tangent of the angle will be rise/run in the second case. (After all, that's the distance the train "runs.") Others say "run" is the base of the right triangle. Some say it's the distance along the hypotenuse of the right triangle. There is a great deal of confusion in the literature about what "run" is.