I spotted this graffiti moniker today while walking between tanker cars across the river from where we live. These markings, often including a name and date, are a railroad tradition dating back to the late 1800s. A little online research revealed similarly themed monikers by Impeach/Mpeach, a member of the graffiti crew, AMFM. These monikers feature the same guillotine and rolling head imagery, but with different text.
