My son is nuts about the whole wooden train thing - We have tons of track and dozens of trains (and a much lighter wallet!). Hint: Skip the Thomas/Brio tracks and just get their trains and buildings. Buy track at Target or someplace cheap, it works just as well.
We thought about just getting a chunk of plywood, adding casters and then painting it and adding edging, but decided that it would be easier just to buy one. Costco is usually the best place to get these things - We got a whole train set plus a train table with drawers underneath for storage (key!) for < $100. They have a pretty cool set there this year which has an nice setup of elevated track in the same table we have, a good buy.
- G