Skipping ahead a bit to current events: the mainline roadbed has progressed, at least in partial form, from the helix around the loop at the other end of the room (around the future logging camp) and back around to the upper level loop around the top of Marshall Hill (center of room). I had planned to offset the two loops somewhat so that the lower track could be at least partially visible (not entirely in a tunnel), but with the upper roadbed temporarily in place it became obvious that the small offset I had allowed would not allow any reasonable hill slope (or even a vertical cliff) in most places. Fortunately I also realized that the aisle next to the helix was 39" wide, far larger than my standard 24", so I decided to cut down the aisle by extending the lower track loop outward. The lower track should now be able to stay exposed for 75% of its circle, only entering a tunnel where I actually wanted a tunnel in any case.
In the photo the old roadbed is still there (with a piece of flextrack pinned in place), and the new path of the lower track roughed in about a foot to the right.
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