It's one of these:
We put it in almost 8 years ago. The #8 frog is so long that scale wheels (and some hi-rail wheels) would have problems. So one of our members machined it from aluminum (it has curved edges to match the radii of the component curves). Ross has the PDF files for 1:1 printouts of their products for planning and it was perfect to make the piece. It has a shaft that runs through the base of the frog and is actuated by a second Tortoise machine tied into the one that moves the points. A little bit of the frog was machined out to make notches for the point and the tail end where it swivels.
