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I'm using RealTrax on 1" foam glued directly on 1x3 bench work and it stays in place just fine without any fasteners. If your layout is stationary, screws into the foam might work just to keep the track from drifting, assuming the foam is the high density stuff, but my guess is normal vibration will cause them to work loose over time. My biggest concern would be transition points for any elevated tracks. If you have track plus roadbed, it looks like you'll need pretty thin 1 1/4" - 1 1/2" screws.

In my case, I don't think screws into the foam only will work when my table has to be moved, so I plan on using long screws to hit the benchwork in key places. I already know a 4'x8' oval will hold with just 4 screws on the corners into wood, but I don't know it that will be true if I switch to ScaleTrax with/without roadbed. I will be tackling the problem in late February and I guess I'll find out then. 
Originally Posted by Jumijo:
The screws WILL hold in pink or blue foam. That was how I secured my FasTrack to my layout. The screws do make the track much louder, even without going into the wood. To reduce that noise, I'd suggest using rubber O rings between the screw and the track/roadbed.

May I ask how long the screws are? Good tip on the O rings, I didn't know they made them that small. Do you use countersink screws and are you able to put the O ring in the countersink hole?
Originally Posted by Jumijo:

The screws WILL hold in pink or blue foam. That was how I secured my FasTrack to my layout. The screws do make the track much louder, even without going into the wood. To reduce that noise, I'd suggest using rubber O rings between the screw and the track/roadbed.

you must run your trains with the sounds systems off.

Originally Posted by old ironside:
good to know, in addition, if my screws do go through the board, I could glue foam board underneath and thus prevent children from hurting themselves when underneath
1/2" roadbed plus 1/2" foam equals 1", so you need at least a 1 1/4" screw with the 1/4" plywood and 1 3/8" should get you in without going through if you use 1/2" plywood. Personally I would go with the 1/2" plywood.

The bigger issue though is going to be noise. I had my RealTrax on plywood temporarily and I was amazed at how loud it got when I moved it to my 1" foam bed, and that is without screws. I've since put a drop cloth under it for a temporary Christmas layout and the noise level dropped a lot. It appears that RealTrax is great on carpet, but foam acts as a resonator. My suggestion is to run noise tests before you glue/screw anything. My LHS has their layout on indoor/outdoor carpet and it is quiet. I'm rethinking my use of both RealTrax and foam. My layout is going to be in my open-plan living room, kitchen and family room, at least for a couple of years, so noise is important to me.
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