Jeff, thanks for the info. I think he’s already going to have to use a double or custom portal because I don’t “think” there’s enough room on the left side of the wall to angle a single portal perpendicular to the train, but I hadn’t thought about the cab hitting. That’s another reason I favor cutting a large opening so the tunnels can be customized to where everything runs smoothly and can be upgraded more easily if a new engine doesn’t quite work.
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