To make sure all the bridges and viaducts worked correctly and looked realistic, I made several test implementations of these features before I cut into the main layout's foam board.
I had to determine the proper scale depth for the highway underpasses, and make sure the various bridges worked. I had planned to implement 5 viaducts over the highway, 2 trestle bridges (1 single track and 1 double track) over the river, and 2 plate girder bridges over the creek below the waterfall.
It was a good thing I did this testing as I messed up the foam board on my first attempt, and completed 2 more tests before I had the technique of cutting & gouging down that left a realistic resulting landscape.
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