The two products I choose were Loctite Power Grab All Purpose interior construction adhesive and Dap Dynaflex 230, premium elastomeric interior/exterior sealant.
I usually have had the best results with Loctite products and because it says"adhesive" on the tube I figured this would be my end choice over a "sealant" . However if you look at the photos, the Loctite product has peeled away from the foam roadbed and does not stick to the track ties all that well.
On the other hand, the Dap product performed very very well in my opinion. The Dynaflex has stuck to the track ties and foam extremely well and the foam is stuck to the wood very well.
I can remove the foam away from the wood with the Dynaflex, but I have to use a blade/putty knife and the foam comes up intact. I believe under normal use the track and roadbed are "stuck down" and should work with no problems. I used white Dynaflex for my test but have purchased several tubes in clear.
The photos show pretty well the results.
Hope this might be of use to someone.
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