I trekked out there from CC by foot again this morning to mark some high spots and general areas of interest. In doing so I found that 84 seems to be the right height for the rail, accounting for occasional stations along the way.
It has been adjusted now, with Ken laying gray clay like a madman.
If I hadn't stopped him he'd be to Southlantis by now.
I laid a path of signs on the way out with height and distance, so once the map gets updated we'll be able to talk stations. Fun stuff.