Gluing Track To Foam

[RobertInOntario]

The caulking is good. You might also try Gorilla Glue but use it very sparingly -- if you don't, it bubbles up as huge, ugly bubbles. White glue, so I've learned (because it's water soluble), is not good because when you apply water -- say, during ballasting or something similar -- the water will loosen the glue & the track will come loose.