Here is my plan so far

Very nice Jack.  I like the reverse interaction between the green and orange lines. The yard set up looks like there could be some nice switching action. 

Assuming you can walk completely around all four sides, I like your plan.  But what is the purpose of the "wavy" part in the top part of the oval (scenic element, place for power control) and why does your orange reverse loop also appear to have some "waves" built in?

Chuck

Can't tell how wide....just make sure everything is within 30 inches of reach...may be tough to reach those "center" tracks...

The wavy part up top are big 0120's...was told to consider breaking up the "racetrack" and I am glad I did. Plan on putting some nice scenery there.

The wave on the reverse loop is to get around the support column.

Yes this is away from the wall so you can walk around it. Measures 20'x76" with the L 4'x5'

Center will be a bit touch to reach..but I can do it.

I plan on buying a few more kits for the town section on the left. 

Where would you guys put the road,or roads and how would you set up the town? I know I want to use sidewalks and some parking.

Here is the latest refinements. Thanks to Carl(Moonman) for the ideas.

Similar "L" to my subway design but on a smaller scale.  There is no need for the switch on the brown line at the bottom as you cannot get into your yard tracks when a train switches from there.  If you could somehow get rid of the wave that would be a plus.  If you eliminate the switches on the green line at the right and widen the loop you could perhaps extend the brown line into the loop along with the green line so you can have both lines go into your tunnel.  What this means is the elimination of 4 switches and the wye and less complications.