My layout rectanular longest dimension is oriented geographically north and south. As I normally face my layout I am actually looking westward.
I learned from a signal maintainer that as you faced the signal case/bungalow, west was to your left, east was to your right irregardless of geographical track orientation. Of course railroads can define directions as being as geographical or what ever they define directions to be.
So on my empire, I say my train closest to me is eastbound if traveling left to right, and westbound if right to left, and what is straight ahead is north.
How do operators define mainline directions on their layout, and also say for yards and sidings, if they concern themselves about such trivia?