Attaching track to foamboard?

[RobertInOntario]

Are you using cork (or other) roadbed?
In either case, a thin layer of caulking is all you need. White glue will not really hold, and may give out when you ballast.
Use a latex caulk (or any paintable kind) and only enough to hold. Spread it with a putty knife and if it oozes up through the ties when you press the track down, there's too much.
Andrew

Thanks, Andrew. I'll try this.

BTW, I'm not using any roadbed this time! I'm just tacking the track to the foam and hoping I can simulate enough of the roadbed through my ballasting. While this is not as realistic looking, it does nicely simplify the layout and makes easier to adjust the track/layout.

Rob