The Crogga River is the boundary between the parishes of Braddan and Santan. The admin boundary shown here appears to be about the right position for the river, so I would guess the blue line is inaccurate.

Approx position of new Southampton farmhouse and dairy unit.

The old Southampton Farm is now Ard-ny-Mara House and tourist flats. A new Southampton Farm has been built further up the track

There are two labels on Santon Railway Station.
One is Santon, the other STANTON.
I'd try fixing this myself, but Stanton disappears in Potlatch. Perhaps its part of a different dataset?