Double deck....

I'm not that good a dreaming up trackplans - I tend to be hopelessly straightforward in my designs - but it appears that you have adequate room for a helix next to either of the doors in the room. That should help. As you do the Coos Bay Branch, what were you considering in the "from where to where" category? Would Eugene Yard be represented on the layout, or would it be staging? 

I believe there is a connection in there somewhere with the present day Portland & Western (formerly the Oregon Electric mainline) as well.

Ok

Ok Dale, here's an attempt to fill your space.

You didn't mention era (which makes a big difference with how long a 20 car train is), scale (I'm assuming HO), your desired (or required) min radius and turnouts (I'm assuming 30" and #6 on the main). And you didn't specify the width of the doors (I'm assuming 3').

You have a conflict with CTC and the Coos Bay branch - as far as I know it never got CTC.

So here's a very rough idea of what I could fit in your space after at least 3 minutes of careful thought. It's a point to loop configuration with the loop being at the far end of Eugene staging. It doesn't include any mainline running to feed Eugene. I did keep the aisles (mostly) to a reasonable width and the grades below 2%. Coos Bay, being a seaport is at the lowest elevation, Eugene is at the highest. I also didn't draw in any sidings or spurs. Unfortunately it seemed to require a helix between the two decks - in this case one with 3.5 turns.

Trains starting at Coos Bay run clockwise around the room on the lower deck tracks (light gray ballast) before ducking into the helix. 3.5 turns later trains pop-out on the upper deck (green ballast shoulders). Unforetunately the trains reverse direction coming out of the helix - another un-optimal compromise.

On the upper deck the trains make another lap around the right end of the room before crossing the aisle on some "nod-under" benchwork (a lift out is probably not practical here) before getting to Eugene staging. The staging area crosses over the staging aisle on another piece of "nod-under" benchwork. I easily fit 4 tracks into staging with track lengths of 14' or so - enough for twenty 40' freight cars, engines and hack. If you're running longer rolling stock fewer cars will fit.

There's about 43' of track on the lower level not counting Coos Bay itself or the helix. There's almost 60' on the upper deck not counting Eugene or the helix. A 3.5 turn helix with a radius of 36" has about 65' of track in it meaning a bit over 1/3 the run is in the helx (ugh).

So this is just a starting point - major changes are probably necessary to arrive at an optimal plan for you (and that's if I didn't guess wrong about scale and minimum radius.

Hope this is of some help...

Charlie

Perhaps this will give you some ideas.

thats what im talking about

my era is the late 1980s, but wow thats been the biggest help i have had. im doing reserch on the area to pick the industrys and im going to ad6 in to coos bay  for a water front. i can invision a set of sd9s winding in the coast range and hearing the dynamic brakes wine now.

start with maps

I'd start out gathering maps of the line showing the track arrangements, major structures, and notable physical features.  If the line still exists, I'd visit and document it as much as practical.   Use these for inspiration in drawing the track plan.  After all, you do want the layout to have some semblance to the real thing, not just another generic port scene, etc. Too bad Signor hasn't done a book on SP in northern Oregon.

id love to see it but i live

id love to see it but i live in GA i havent see that line for years. but that what i get for joining the army