When I got my Fast Tracks point form tool I got a couple tools to as well including the Zona adjustable jewelers saw. Fast tracks includes a package of replacement blades with it… but this isn’t just a bonus… these are the blades you should use for cutting track. The saw, for me at least, came with a blade pre-installed. I didn’t take a close look at the replacement blades, just put them in the toolbox.
It turns out I should have looked closer. In the above picture one of the “replacement” blades is in the saw but what originally came in it is that huge black line to the left. Only after getting terribly frustrated cutting gaps did I figure it out.
In retrospect the teeth were comically large for cutting rail.