AT that stage where I want to put a finishinbg edge on my layout and have seen a variety of things done.
Most seem to use a fibereboard panelling cut in lengths but I am open to any ideas and sources [I am located in Canada so Home Depot and Home Hardware are my best sources here].
I also want to add some plexiglas safety rails along the front edge strategically for “small hands”…
Something to be careful with is the ‘edge’ of whatever sheet material you use. You can use a router (or router table) to cut a curved edge, and there are hand tools for acrylic work that will cut and if necessary polish a plastic edge.
I’d use Lexan polycarbonate rather than Plexiglas or acrylic plastic to keep little meddlers at bay. Be careful when you clean it; it scratches surprisingly easily.
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Hardboard, or masonite, works well because it is thin, flexible and easy to paint. Rona and Home Depot sells them in 4x8. Home Hardware too, but not at all outlets. I’m not a fan of plexiglas, but I don’t have young kids in the household anymore…
Simon
I too am not a fan of plexiglas but need a buffer for “grabby” fingers. It tends to easily scratch meaning replacement looms.
Hardboard is likely where I’m going.
I don’t know how high is your layout, but you can always make a higher strip to protect the layout. A 1" or 2" high fascia would not be too much of a visual barrier for adults, but would lower the reach of kids. And I would not let my favorite brass loco near the edge 
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Simon
Two levels, one at young child height [42"] and second shelf at 58".
Agree about raising hardboard edge but want to view upper deck, hence the consideration of plexiglas on upper deck at viewpoints.
Thanks for input ideas though.
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I’ve used Plexiglas for years. It does scratch, but works well. It is four inches high. I cut a 3/4 inch slit in the 2X4 that supports the layout. I can take out or drop in the 4 foot sections of Plexiglas easily. Grandkids don’t seem to mind and it keeps fingers out.
Useful guide to finishing the edges of cut plastic pieces:
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