My chief engineer has gone home with his Mom and Dad. Before he left, we had the Polar Express on board and ran both trains simultaneously. The power supply handled it with no problems at all. It was a lot of fun and there were a lot of lessons learned. Just like when I was his age, you just have to see how fast it will go. The permanent layout will have guard rails. 
We managed to keep them from going over the edge, but we got close a couple of times.
Got some hard decisions to make. Not sure retirement income is going to be compatible with a large O gauge layout.
