I finally got around to hooking up the woodland scenic buildings with the light hubs etc and a 20 volt AC power source off a lionel ZW. At first there was nothing but then I turned up the power on the light hub adjustment to full and got a somewhat weak light in the 4 buildings. When I plugged in a 24 volt DC supply, the lights and TVs were bright and flickering. I love the flickering TVs and the 20 Volt AC was weak and u had to look close to see the flickering.
So I ended up going with the 24 volt DC supply which is hard due to the separate plug etc.
There were comments in the thread about the cost of Menards 5 amp 4.5 volt power supplies. I just use a 4.5 volt 18 amp power supply for all the menards and individual Miller signs and it works well. Others have said to put in 5 amp fuses which I did in case their was a short. So far its working well.