I'm sure that the C&S error was similar to what you found with the Roswell line. I should visit that again and see if I can figure out what happened. I recall that the location of the siding was correct but the curve had slid down between the bridge and the siding. The curve should have been a few chains further down the grade. It made me realize why I couldn't get the overlay to work on the aerial by using the curve and the bridge as reference points. It shifted all of the other bridges out of position as compared to the aerial. A simple transposition can make modern day RR archeology a challenge.
Dave