Todd Brody said:
Lay a line of Titebond III along each side of your roadbed and put ballast over it. Use lots of glue and build up either side so as to make a trough down the center. Release the track from the screws and fill in the trough around and over the ties with more ballast so that the track now free floats between the two ballast berms.
I use a similar method …I mix Portland cement ( instead of Titebond )in with the ballast material and use it to hold the loose ballast