I don't know about the tracks, but since one can jump on/from a synthetic/composite surface I'm guessing they're a permanent fixture, and just covered with a thin layer of artificial snow.

I'm not afraid of heights, but looking up, and down this jump made my head spin! And this jump is built to be "jumperfriendly", in the sense that the slope follows the jumpers most likely trajectory so that he or she is rarely that high above the surface. But it's amazingly steep.

I've seen on other events that there's a kind of bar in front of the jumpers as they move onto the bench, that is lifted once they're ready to go.