Thank you both!
Much of the NYC Subway has the same issue, often being chained from a location that either no longer exists, or has been changed enough that accuracy is suspect.
NYC subways have a few problems…but they change the routing of the routes so that it cannot be considered by given train with few exceptions. I think the A train from start to finish is intact including the additional miles to Far Rockaway being added later. The 1 train remains as does the 2 and 3 trains…but the others all have different and often changing route lengths. Still, whatever the number plate on the signal or box or whatever says, that is the place on file as being there.
Well, it does provide more work - and maybe full employment - for those of us who do understand the concepts !
I’ve discovered that PennDOT has the same kinds of problems resulting from a 1980’s change from Legislative Route numbers and engineering “stations” to the current “Locational Reference System (LRS)” for the “Straight Line Diagrams (SLD)” and other uses, which is a 4-number County - State Route - Segment - Offset* system. I can document missing/ overlaps of distances from the hundreds to about 1,500 ft. without too much trouble - and this is on major roads, too ! The engineered/ surveyed roads have the best old records - the ancient Indian trails/ wagon roads here in the eastern US from before the American Revolution that were later just paved over and have since become highways are the worst. I agree, it’s amazing how well those old guys did with their simple instruments and techniques (often using the ‘railroad’ definition for curves, a detail that’s often overlooked today, too).
(*Offset in this instance is measured longitudinally = along the road, which offends the construction stakeout surveyor in me that was trained and worked with offsets as being