People are always looking for ideas for temporary layouts. This one seems to work really well for me.
1. Portable folding table
2. Two halves of a 4 x 8 sheet of 1/2" plywood on top
3. plywood covered with 24 x 24 inch foam tiles.
I am finding that the tubular track doesn't come apart from train motion and nothing is sliding. The accessories stay put and the entire layout is quiet to boot.
Take a look: