Being electronically stupid, and desiring to render these types of concerns substantially moot, I just ran a brand new dedicated 20 amp line from my breaker box over to my train layout, with a GFI breaker in the outlet. I bought and pulled the romex myself, and also installed the box and outlet, so all the electrician needed to do was to put the end of the line into the box with a new breaker. I left him lots of extra wire to do this. He only charged me $75 to come over and do this, including checking my outlet box and testing the line.
If your layout is in the basement, with all of the overhead floor joists exposed, then just to it. :-)
I guess that if somebody tells me that this is "too much juice" I can always just use the old 15 amp outlet that was already there.
Mannyrock
