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This is a Baldwin smoke box cleanout in 1 1/2" scale. The origins of the design began around the late 1800's as an in house design. The cleanout was used on many locomotives and wheel arrangements. ALCO and Lima would later go on to copy the design and so it was found on almost every locomotive until the super power and USRA era. Designed to fit an 8" diameter smoke box which will work with a Railroad Supply Mogul.