04-07-2011, 09:49 AM
Not sure about the electrofrogs, but the Zephyr will power this - ideally through a proper heavy-gauge bus running under the layout. The limiting factor is not the size of the layout, but the draw from all the locos that will be on it simultaneously. IF that total exceeds the output of the Zephyr (~2.5 Amps?) then you'll need to divide it into blocks and run a booster.
Andrew
Andrew