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Two rare earth magnets stick to the tops of 10-24 bolt stock. A piece
of right angle bracket drilled and tapped for 10-24 holes mount the
bolts to a tortoise switch machine. Two nuts are used to lock the
bolts to the angle bracket once the depth is set. The nuts are too big
to fit side-by-side, hence the tapped holes in the angle bracket. I
cut one of the mounting "ears" off of the switch machine and used
velcro to mount it under the layout.
Magnets and bolts will slide through brass tubes inserted through
the sub-roadbed up under the ties. In the "up" position the magnets
just touch the underside of the ties. In the "down" position the
magnets are far enough away from the track to not affect the trains.
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