I have nowhere near the expertise of some of the posters here. That said, I have built a number of train table, and have employed similar techniques on other projects (Model Railroading does teach skills that are useful elsewhere).
I build my layouts in a semi-modular fashion. I build sub-assemblies consisting of framework and tops that are glued and screwed together. Legs and bracing are bolted on, and the resultant tables are bolted together.
As far as framework goes, all my layouts to date were built with 1 by 4 pine. But when I moved my current layout, I found it was sagging a bit in the center, along the long side, so I sistered some plywood to the frame. I used 8 inch wide by eight foot long pieces, with the extra material above the table. There is an added benefit of the boards preventing trains from traveling to the floor. And they can be decorated.
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