Not trying to be smart, but railroad ties are made of wood! I'm sure you meant spikes?my brother in law made a couple from rail road ties. He just used a propane torch. Was able to flatten the blade and twist the tie to make a handle. Used his bench grinder to sharpen the blade, then finished with polishing stones. Pretty cool. I'm sure it'll rust up like a son of a.... Could use the "hammertone" paint and help protect it a little bit.
Not trying to be smart, but railroad ties are made of wood! I'm sure you meant spikes?