SSW Shelf Layout - You comments

[Sumpter250]

Looking at your plan, and purpose....this thought:
The track that leads from "International Paper" , down and left across what appears to be open space. Because the layout framework faces, on both sides form a wedge.....how about two ( yes, two ) roll around "inserts", one having a bridge across open water, the other having an "operating" car float with the docks.
With what looks like 1.1M ( about 3'-6" ) distance, the "bridge" could be used for constant running, and the car float when switching only is preferred. And....therefore...no "duck under's".