We spiked down the track on the WS foam atop blue styrofoam, and the track will stay in place, although it's easy to lift it, without tools. I assume that ballasting with white glue would make the whole thing more permanent, especially laterally.
On my own layout, I put the cork down using yellow carpenters glue, then tack it in place with 2 1/2" nails every few inches (I had about 2/3 of a 50 lb. box of 'em leftover from building my house) - I just tap them in far enough to grab the subroadbed, then pull them out by hand the next day. A quick pass with some #36 sandpaper on a block of wood evens out any irregularities, and you can taper a 3' section from full height down to nothing at the opposite end, using the same method, in only 4 or 5 minutes. I used Atlas track and their track nails to secure the track, both on the cork and directly on the plywood subroadbed - they say that you can remove the track nails after ballasting, but I didn't bother.
With the WS foam roadbed atop styrofoam, it's pretty much impossible to drive the track nails too tight, as the foam doesn't grip them at all - the nail gets pulled back up as the bent tie flexes back to its normal shape. Cork holds the nails a bit better, and if the track nail goes into the wooden subroadbed, you have to be careful to not drive it too far, as it will deform the tie (pulling the rails out-of-gauge) and not return as the wood will grip the nail firmly.
We'll probably be doing some ballasting on the WS roadbed sometime this year, so we'll see if it's as easy as on cork and if it holds everything in place as well, too.
Allan, I'd like to see your pictures: you can create an album here in the
Gallery or on
photobucket, then post your pictures from either place right to this Thread.
Wayne
:-D:-D 
