That was very interesting. I had always thought him a mythical hero as well, but no. A 19 year old, sentenced to a felony for stealing something worth ~$10 (at the time). Then through the urging of a private company that utilized prison labor, worked him to death on the C & O railroad.

He wasn’t driving down the steel spikes that hold the trail rails down, but instead was tasked with punching 6 inch holes into sheer rock, so that dynamite could be set inside. Miners who were familiar with the practice, would refuse to work in the holes until the dust settled from the dynamite blasts, which was delaying completion of the tunnel. But if they used convicts, instead of professional miners, then they could push the workers back into the tunnel while it remained filled to choking with silica dust. This private company, worked these young men to death, then shipped them back to their prison, where they were unceremoniously buried in a mass grave behind the prison. This is the fate of the famous John Henry.

Somehow a space ended up in your link for me on Connect - going to try making one here