Hi Brendan
The siding at Pinesul is not a siding at all. It will be a sulphur plant which is served by two spur tracks. It will be somewhat compressed from the prototype.
The track below Pinesul on level one is a spur that services the PG sawmill. This is where they load centerbeam cars with lumber.
I have a few prototype photos at home that I will post tonight to give some idea of what I am talking about.
Chris