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Train line graph. The red lines are westbound trains showing their movement (mileposts are the y axis) over time (x axis). blue lines are eastbound trains. It shows you where meets occur (red and blue lines cross) and what time (point on the x axis) and where (point on the y axis). You can see how fast trains go by how 'steep' they are. The more parallel to the y axis the faster they go.
The "count" is showing total trains over the time period for a given point on the mileposts. The thicker the 'count' the more trains that milepost sees. You want a 'count' graph to look roughly like this without any bulges. It should look like a snake, in other words, not like a snake which has swallowed a hog.
This is a well planned and dispatched line, wherever it is.
Thank you for that info. This line runs from Tulsa to Springfield, MO. Not much traffic, but the trains come by at a pretty persistent time everyday.
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