Milepost differnces

[NW Mailing List]

I am confused on the milepost for Kenova to Portsmouth. I did a 6 year listing of stations and sidings for this line, August 1964-December 1964, 1966, 1969, 1972, 1977. One example is Hanging Rock, Ohio. 1964 is MP 541.03. 1977 is MP 543.64. The 1950 track chart has Hanging Rock as MP 583. That is a 40 mile difference. 
An 1899 alignment chart has Hanging Rock as 583. Most of the drawings are 583.
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Jeff Wood