Jan 26, Layout Surface: Plywood or Foam?

Q: I am planning a 4X6ft. N scale RR. I plan to use a 4X6ft. piece of plywood. I want to nail the track to a cork sub roadbed. What advantage does foam have? Thanks. A: The main reason I like to use foam pads as a layout surface is that if you want to dig out a creek, a lake or a ravine, it is much easier to do that if the surface is foam rather than plywood. It’s also helpful if you want to put a magnet under your track to use for uncoupling. A third reason is that it is easier to manage wiring. You can run wires easily through the middle of a foam pad to the side of your layout where your turnout switches or control panel might be located, or to run wires for an new light fixture that you want to put in the middle of your layout. Fourth, you can more easily embed a structure into foam so that you don’t have the foundation of your structure hovering over the surface of the layout. It’s also easier to plant trees in foam than in plywood. Foam is quieter than plywood when running trains. I also think that nailing the track down to plywood doesn’t allow for expansion and/or contraction of the track as the temperature and humidity change throughout the different seasons. So after a few years, you might find your track buckling a little. You still need the plywood under the foam pad for a good, steady layout surface, but for all the reasons above, I like foam pads on the top.
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