Mike, Dave, and John, thank you!!! I just took some photographs of the room to show the space. This is the door at the upper left, the main door from the staircase and the closet where I have all my engine and rolling stock boxes stashed. First is entering the room and then exiting the room. You can see in the upper left of the first photograph the bulkhead that covers the I beam and return duct that makes for a problem connecting the Ceiling Central RR between sides of the room as Brian asked about.
Next is standing near the middle of the room facing the front of the house, the opposite direction from the current train room. We hardly use any of that area. Actually the built in book case, which is 15" deep can come in handy. The top of the book case is 42" off the floor. The window sills are 54" off the floor. Quite workable, I think. The door from the first two photographs is just visible on the far right next to the light switch.
Next is turning around and stepping back a few feet looking towards the back of the house. The piano, sewing machine table, and some boxes belong to our older daughter. We plan to get the piano etc moved out this summer. In the back to the right of the piano is the door to the train room with the blue walls. In the middle is the door to the patio. The five feet I can use that I mentioned is the corner where the desk and filing cabinet are. Now you can see the Ceiling Central RR.
Here is the bugaboo corner with the three doors, the corner between the piano and the desk. See how thick the door jam is to the train room. This was the addition my in-laws put on that was not very well thought out. The door opening is only 21" wide, and the wall is concrete block with brick on the train room side. A few pages back we discarded every idea to go through the wall, through the laundry, or the door. The only possibility was to have the Ceiling Central RR dip down so trains could go through the top corner of the door where I have the new wire I just pulled in Friday with the intent of connecting DCS to both the CCRR and the shelf on the far side of the blue room. I really need to keep this area open, or I may blow the whole project since that is where traffic goes from the laundry, stationary tub, the rest of the house and the back door. 
Both John and Dave are on similar tracks. Stack the two end loops. The upper town which is Thomas on the real Blackwater Canyon Line can be in the yellow as in the current plan. The lower town which represents Parsons (the one I started building can be in the back by the back door, and the line continues on towards Elkins which would be the lower stacked loop. I do agree with John, I want to figure how to do this with no duckunders or pop ups and no stretching, climbing. The doc says he wants to wait to replace my left knee after I retire in 3 years. The last few months the right one is acting up too. I also have a rotator cuff injury that is non reparable, just more PT, that acts up when I stretch too far or lift. Like a former coworker who got all his injuries riding motocross told me, "Mark, you never get any of injuries having fun, yours are all from work!!" Mine are all from crawling on the floor too many years at work before I got my engineering degree and got a desk job at age 51, falling on ice, and falling running to catch my ride up the mountain to work. 
Dave, I just saw the post you made about the wye. Yes, I agree, that would just be a mess. Thank you and John on pointing out how much room that takes.
Well that gives some reference of what I have here. Thank you everyone for all your input!!
