Yep, the easement into and out of the grade for anything that has more than four closely spaced wheels will take up considerable space! I have a 2.5% grade on my layout, and I had to use about five feet for easement into and out of the grade. In my case, that was to allow big stuff to run, I have a lot of scale articulated locomotives like Challengers, Big Boys, Y6b, etc. The goal was that they could run anywhere on the layout.
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