i read about making things from rr spikes. i have been trying to forge a couple of hawks from them. my question is this,some of the spikes are marked on the head "h.c." and "h.c.s." ive read that they are high carbon steel. is this true? are the ones not marked mild steel? does anybody know why they use 2 different types of steel? there are other kinds of steel laying on the tracks. one piece is rnd stock bent almost in the shape of a paper clip,its used to "clip" the track to the tie. is this a type of spring steel? i live near many many sets of track and see these pieces of steel constantly. but i have no idea as to what kind of steel it is. i was thinking it would make decent steel for making hawks or tools or other things that dont need as delicate a ht and temper as a blade.......willy