Finally, I just jumped in and started soldering and glueing track. I extended the forwarding yard about a foot. It handles 3 trains each 16 cars long. (That seems to be a decent size). There are 3 tracks going to the Car Shop, another 2 to the Engine Shop and a bypass around the Shop to the servicing facility.
There are 3 tracks in the receiving yard. In addition, there is the lead-in "behind the tower" to access the receiving yard southbound, and the "thoroughfare" which runs from Lee at the north entrance to Duke on the south.
There are 8 tracks on the class yard and a drill long enough to handle them. There is also a "working " hump. Well, maybe not working, but there is a hump there and I was able to push a string up and decouple them one at a time and gravity roll down the class track. The cars roll about 2/3-3/4 down the track, but as they begin to stack closer to the hump, they hit pretty hard. If I could fix it so that I could vary the height of the hump, I could vary the amount of roll.