Help with spans and areas

Railroader
1

I have two questions if anyone has any idea on how these things work

  1. can I have an area within an area, or will that create some conflict with the game logic

2.does it matter where the upper or lower end of the track spans are placed? ie a interchange, repair track, or pax station, I ask cuz I feel like with interchanges and repair tracks it probably doesn’t matter that much but with pax stations it probably matters alot, is upper span the front or is it lower span?

2

#2 matters for interchanges: Cars delivered to interchanges will be placed as close as possible to the lower marker.

I don’t know if it matters in any other case. It probably does for the teleporting industry components.