Baldwin 60000

The Baldwin 60000 is an experimental American steam locomotive built by the Baldwin Locomotive Works in 1926, constructed as a single one-off unit to test a high-pressure water-tube boiler design intended to improve steam locomotive thermal efficiency well beyond what conventional fire-tube boiler designs could achieve. Built with an unusual triple-expansion arrangement using the high-pressure steam in stages, the locomotive was extensively tested on Baldwin's own test plant and on several American railroads, but its complex and costly construction was never adopted for wider production, reflecting a broader pattern in which many ambitious high-pressure steam locomotive experiments of the era failed to prove economical against simpler conventional designs. After its testing career ended, the Baldwin 60000 was donated to the Franklin Institute science museum in Philadelphia, where it remains on permanent public display.