April MR did a piece about mounting Tortoise machines on foamboard. The author (Mike Berger) makes a 2.25 * 1.75 square hole clean thru the foamboard and sets the tortoise in from the top. He fastens a piece of perfboard to the top of the Tortoise to keep it from falling thru the hole onto the floor. Looks neat and bypasses the problem of fasteners don't hold in foam. But thinking about it, you have to locate that hole pretty accurately BEFORE you lay the track. The usual undertable machine is installed AFTER the track is laid and is aligned to fit the turnout. This way the tortoise goes in first and I guess you align the turnout to fit the immovable Tortoise? At a guess you have to get the throwbar of the turnout aligned plus/minus 1/8" with the Tortoise operating rod for things to work properly. Does this really work? Anyone tried it?
David Starr