Videos & Photos Videos Series Railfanning What is a wristpin?

What is a wristpin?

By Angela Cotey | December 19, 2013

| Last updated on November 3, 2020

The steam boss explains for the Diesel heads among us

With so much talk about Union Pacific’s effort to restore Big Boy steam locomotive No. 4014, the world wants to know … what is a wristpin?

Listen in as UP steam boss Ed Dickens Jr. talks about this 50-pound plus hunk of metal without which a live, steaming Big Boy would grind to a halt.

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