ok here is a picture of the rr spike after forging out under power hammer heated to beyond magnetic (cherry red) then quenched in my beeswax and crisco mix . set over edge of anvil and hit with hammer as you can see this is hard. this spike is new and is not from the 60s i do not know when or why they made these but they are high carbon . a mild steel treated the same way will bend and not break.