The smallest and oldest locomotive at the Age of Steam Roundhouse Museum in Sugarcreek, OH is the Carnegie Steel Company 0-4-0ST No. 14 built by H.K. Porter in 1897 under work number 1726.
It was later renumbered to U.S. Steel No. 727 and worked at the Cochran and Duquesne Steel Mills until it was plinthed at Station Square in Pittsburgh, PA before it was relocated to Sewickley.
In 2013, it was sold to Age of Steam and trucked from Pennsylvania to the museum, where it was cosmetically restored.