It sounds like a folded figure eight (maybe stacked, not really sure of the right term) on the shelf would be the right idea.
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Anyway, twice around the room to complete a trip.
Are you OK with a duckunder or lift out bridge? If not, fitting two turnaroud loops in a 10 by 10 room will eat up a lot of space.
-Kevin
Living the dream.
I would appreciate suggestions for an HO track plan for a 10X10 room. I would like it to be a shelf layount around the room emphasis on just train watching. Twice around would be nice. Era: 1919