I think one should remember that if the loco uses a worm drive it only works in one direction, I don’t mean forward and reverse. The worm gear will drive a cog but the cog will not drive the worm gear. Suddenly stopping a loco from a high speed can strip the worm or cog. Incidentally I don’t really need emergency stop sections on my layout as I only run trains slowly, but I guess they can be a good idea for the occasional emergency. Turning the knob to zero works for me.