Tom Thumb was a small experimental locomotive built by Peter Cooper to demonstrate that steam power could operate on the Baltimore & Ohio Railroad’s sharply curved early track.
The B&O had initially relied heavily on horse power because managers doubted that English-style locomotives could negotiate the railroad’s geometry effectively.
Cooper had a financial interest in Baltimore development and believed successful steam operation would strengthen the railroad and nearby property values.
During the summer of 1830 his locomotive hauled B&O officials and passengers in demonstration runs.
The famous story of a race between Tom Thumb and a horse-drawn railway car comes principally through later recollections rather than a fully detailed contemporary event record.
In the traditional account, Tom Thumb moved ahead before a mechanical belt or blower problem allowed the horse car to pass.
The important operational result was not who won a publicity race. The demonstrations convinced the B&O that locomotive traction could work on its route.
The original Tom Thumb was not preserved.
Smithsonian’s model is based partly on Peter Cooper’s recollection published decades later, and the museum explicitly notes that few contemporary construction details survive.
For TransitSatellite, images should be labeled reconstruction or model, not “the original Tom Thumb,” and the horse-race story should be attributed rather than presented as a perfectly documented timed competition.