The minors have reserved stations (the North Staffs as I recall is one).
As far as I know the privates locations have no effect on the game.
Well your privates have an effect on a different game, but not in 1825...
Yeah but I'm not talking about station circles, I'm referring to text written right on the map hexes with the line with the circles at the end, just like the B&O private marking that overlaps two hexes in 1830.
I suspect it's just for interest, as Gunther suggests.