The AMR fleet seemed to think I should ditch the duckunder / lift / hinge apparatus. I figure it could be as high as 54" so it really wouldn't be too much of an issue. What are the thoughts at The Gauge?
Here's another plan on the same benchwork.
In this design the bridge is required to make a loop. There are single lap helixes on each side to raise the bridge by an additional 6". This added elevation also adds to the physical interest of a "logging" railroad, with spurs and switchbacks included in the area. The resulting elevation of the switchback in the upper right can be over 16" higher than the lowest rail elevation on the layout and still not use greater than 3.5% grades.
I still don't like that in this design I can't reach the back corner. And because I am actually starting to like the idea of a hinged / lift-out bridge spanning the walkway I've come up with a couple other ideas.
Obviously both doors have to come off their hinges, and the only problem with that is keeping the cats out of the room. If I leave off that last 4' section on the 'tail' both doors can stay intact, but of course I loose the 4'

What I like about this arrangement is the 4x8 section in the center is fully accessible and provides a LARGE area for modeling
stuff, more than just running trains along a shelf.
So I think I'm done with the previous layout designs for the time being and am going to work on something for this new arrangement.
Any questions, comments, observations? I'd love to have more advice and general discussion
