Mounting site for uncoupling machine
Pic 9 of 10
The uncoupling machine is mounted under the layout with velcro. Two ¼" holes have been drilled through the sub roadbed and two ¼" brass tubes (non-magnetic!) have been pushed through to allow the magnets to slide up and down easily.

Note the extraneous holes in the sub-roadbed left over from my previous electro-magnet experiments.