Track Roadbed Ideas - Cork or Foam?

[Anonymous]

I used 1/2 inch ply and then covered that with ceiling tiles (the 2 x 4 kind), you can cut them into strips to cover ply that you use for inclines and declines. I then used the Woodland Scenics foam to create the taper for the ballast.

The key is to NOT screw through the ceiling tile into the ply.

[ccilarry]

Does anyone have any ideas or suggestions for roadbed?  I found the Midwest Products Cork and I have found the Woodland Scenics Foam.  I am using plywood for the track base for inclines and ramps.  I used homasite board for the larger flat areas.