Ya thats a great idea.I was thinking about how to put some mini fiddling yard to introduce/remove cars from the layout. The top right looks easy to put in a double track fiddler off the loop. I have a Car Ferry on my layout just for that purpose. That could be possible or if theres room, a narrow shelf on a wall extending out can do the same. Theres still room to add industries if your creative and get more operating interest.
I know this seems to be the most popular way to make terrain, but in (road) engineering, which is where I work, which is somewhat similar to model railroad engineering, some prefer to go up rather than down. That means making predominately fill impacts and not cut impacts. I guess you can use foam in this way, too, but cheap thin plywood with wood risers is an option for woodworker types.The foam layer allows for creating scenery such as mountains, cutting out rivers and creeks. Or just carving out depressions. To get rid of that flat look.
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