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World’s Smallest Live Steam Locomotive?
The smallest commercially available model railroad equipment is in Z gauge or 1/160 scale. Arthur Sherwood of Sydney, Australia (now deceased) built electrically powered locomotives in the 1970’s at half that scale or 1/480. These may have been the smallest elcetrically operated models ever built. Arthur Sherwood was an Australian professor of Mechanical Engineering.

As a relief from such small work at 1/480, Mr. Sherwood built an extensive model railroad system, to 1:240 scale, with several locomotives based on LMS and Southern prototypes. What is more, as one might also expect, he has built three working live steam locomotives in 1:240 scale (which is still significantly smaller). Two of these are shown in the picture. These locomotives have traveled from 300 to 500 feet on a single charge of butane and water.

For more information on all of these locomotives and how he built them, click here.
 
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