[danpuckett]

I use Fasttrack on my O Gauge layout. The layout is on 3/4" thick foam which is on 3/4" plywood. I was having problems with the track connections staying together when the heavy Lionel steam engine thundered down the track and hit the curve. I was continually having to push track sections back together as they would part enough to lose electrical contact. The holes in the Fasttrack are so small that only a nail might work, but I did not want to use nails. I found some skinny drywall screws about 1-1/2" long. I reamed out the holes in the Fasttrack to 9/64", put in the screws and the track is now secure. No more joint separation.
I have attached a picture of the screw.

 

[RickO]

FWIW. Fastrack is designed to take #4 flathead screws no drilling required.

They come in various lengths at the local hardware store as well as online vendors: https://www.amazon.com/Screw-Phillips-Carbon-Steel-Plated/dp/B07CVMDCW2

 

[callmeIshmael2]

A really good, easy way to attach FasTrack to any layout is with a small dab of hot glue. It won't wreck any part of the trackage should you want to sell later, because dried hot glue comes off very easily. To hide the glue dabs, just use a bit of foliage, nuked earth, etc. Works very well. All track on this layout laid w/a drop of hot glue every few sections.