Here is a railroad spike knife I made with a found railroad spike. We used the forge I made a while back. We ended up getting an anvil and some blacksmith tools from another friend. I put friction tape and slightly sharpened it with a grinder. It would probably make a good butter knife.
Here is a video that Alex Hahl made:
It turns out that someone stole our anvil. They are kind of pricy to replace so it may be a bit before doing anymore blacksmithing. 😦