Alignment of towers at two RR's crossings?? (not 90s)

[OldEastRR]

Is there any protocol on how these things were situated? I know the junior road was charged with maintaining the crossing and providing protection. So if they had to build a tower, did they align it to their track or to the senior road's? The front wall paralleled one track? Or was the tower aligned to a street grid if it was next to one? Or didn't it matter? This would be for a shallow angle crossing, not a 90 degree.

[prr7161]

There's probably one of everything out there, but the examples I am familiar with (from central Ohio) are pretty much built parallel to the owning road's ROW.  Whoever had to build the tower would need it to be on their property absent some special arrangement, and keeping it parallel to the track is efficient use of space.