What did you do to your trains today?

Thanks. Yes I made the rock formations. They were originally for a Lionel layout that I had Christmas Village houses on, which is why they are somewhat square-ish. They are made from Perma "R" foam that you can get from your local big-box hardware store here in the US. I believe they are for insulating garage doors.  They are just a little thicker than a single riser. A pack of six is about $8.50. The rock walls in the background are made from the same material. Ed will explain a little more in his video, but here's a picture of them from their original use. I hadn't finished the detailing when these were taken but they show the foam boards nicely.