The Union Pacific Elmwood Route

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Why is the top up on risers? Why not just down on the framing? On the plan it seems like you only have one section to be cut out for a river...the rest seems to be flat. Is there a reason I'm not seeing?

Galen

The river yes, but I also want to contour the terrain along the scenic to go below grade a little bit too at spots. Having the top on the risers also helps with mounting tortoises and other under-bench hardware as there's no cable ways or crossbeams to get in the way.