The wall idea is good but might not fit in with the first loop design. How could I cover it and make it blend in with the other part. I might have to put the bench work in for the city before I can get an idea but it would be beter to have a plan first. The other option is to have the track climb up off the street level onto a mound of dirt with tunnels for the cars at each intersection. Thanks for that idea I should have put a picture of the first loop on with it. I took some beter pictures. It is imposible to get the layout into one picture. The mountain at the end of the first picture will continue across the top of the layout to hide the top curve tracks. These pictures might help a little bit beter to see what the middle loop comes from.
Picture of the first loop bottom of layout. The curve track to the right lead to the middle section.
the bottom track is the track from the first loop picture taken from inside the middle loop.
Picture of third loop from bottom of middle loop.
Picture of middle loop from control center inside of the middle loop
Picture of the third loop from the top of loop