Ooops. It the dang this is metal, following my plan would short out the track.
But, no reason one couldn't be made of wood. Or better yet, use the existing Fast Track sections as molds, and pour Accra-Glass into it to make the pieces out of plastic. Accra-Glass cures in 24 hours, and is incredibly strong. Used to repair gun stocks and glass bed actions.
If you want to make one on 3 rail you could by using 2 rail track, take out the rails from the ties and like a guardrail on a rr bridge, bend the end rail in then spike the rail to the Ties with h.o. spikes.
Repeat on the outside of the track but bend the end rails out and away from the track forming a "y' to push the derailed wheels back onto the rails.