I have searched the internet to find out more information about a particular railroad spike that my father was given when we was young. The two spikes are from a small section of railroad in/near Illinois that was built by prison workers. He was told they we Mulehead spikes. The started out as straight pieces of metal but after pounding, they became flat on top like a flat head or “Mulehead.” I have seen pictures of a similar spikes at RR museum sites but none that are specific to that area or from the prison workers. If you have ANY information on these spikes or could direct me to someone who could provide some further assistance, please let me know. Thank you for your time.