Hi Dave,
The N Scale foam roadbed I purchased from a local shop. But this is the brand (Link below). Pretty common and you WILL NOT have to trim. When you tear it in half (it's meant to do that), it fits perfectly between the center and outside rail. Put the side with the 45 degree angle on the outside to make room for the wheel flange.
http://woodlandscenics.woodlan...w/Item/ST1462/page/1
Here is a grade crossing we did using the same method. We did not even glue it because it fit so perfect.
You can buy the dollar store foam in white or black covered paper. We pulled the paper off to paint it. My son likes freshly paved roads (Home Depot Space Black) where as I like roads that are worn (Whatever grey paint I have). Here are two others I did.
You see my mistake below, I dry brushed my road grime before I lined my road. So you can see were the road turns, it appears everyone takes that curve too sharply.
I hope this stuff helps. I can't take credit for any of it. Everything I learned, I learned from others on this forum.
Ron
