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ONeTrak Module Plan (3x4 feet)
This is my the grand total of my home layout.  With the mine/power station, the yard, and the station on the upper level, it provides quite a bit of operations. 
The first diagram is of the bottom layer which consists of a Mainline which is oNeTrak compatible, a small yard area with turntable, a loop with a reversing loop.  The main industry is a coal mine which provides coal for a power station.  The lower level is connected to the upper level with a two level helix.
The second half of the layout consists of a simple loop with another reversing loop.  There is a town with a station on this level.