Can anyone tell me what the difference is? I thought they were two names used interchangeably for the same thing - but I am looking a hand-drawn track plan here which clearly referes to both types separately. Mostly it shows Trap points on sidings, and mostly Catch points on the running lines.
I assume that both types derail the wagon if it runs away in a siding, or rolls backwards on a gradient.
(Ok so its not "on-track machinery", but it's close. Perhaps it should have been in "Derailed"
)