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Here is my layout plan. It is in a room 26ft by 11ft. and is double decked. The left side of the plan is the lower level and the right side is the upper level. This is a point to point but with a turn around combined with staging tracks at each terminal.
The area that links the two levels started out as a helix but after three turns I brought the track out into a series of spiral tunnels. The layout is about 2/3 complete but changes have already been made and will continue so please, any ideas will be welcome.