How many Union Pacific Big Boys are still running?

Written by Editorial Team | Last Updated: August 2026

Out of the twenty-five massive Big Boy steam locomotives originally manufactured for the Union Pacific Railroad during the World War II era to conquer steep mountain grades, only eight survive in preservation today across various museums and display parks across the United States. Among those remaining historic survivors, exactly one single locomotive—designated as Engine Number 4014—has been fully restored to operational status. It serves as a working mechanical ambassador and travels across the American rail network on special public exhibition tours.

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