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Steam Horse locomotive
The Steam Horse was constructed by the Butterley Company in Derbyshire in 1813 by William Brunton (1777–1851). Also known as the "''Mechanical Traveller''" it had a pair of mechanical legs, with feet that gripped the rails at the rear of the engine to push it forwards at about three miles an hour.
==Design==
To modern readers it may seem a comical contraption, but it provides an interesting insight into railway thought at the time. The collieries were well served between towns by the canal system. From the pit head to the canals, horse-drawn wagonways had been constructed and steam engines were seen as no more than a noisy and dangerous novelty. However the Napoleonic Wars from 1799 to 1815 had brought a great increase in the price of fodder. Moreover, some such "railways" were being constructed on the steeper gradients within canals, as for instance on the Charnwood Forest Canal.
Nobody believed that steel wheels on smooth steel rails would give enough adhesion until Stephenson and Hedley proved otherwise in 1813 and even the former considered 1 in 100 (1%) was the absolute maximum grade. Consequently such steam operated systems as there were, were operated by cumbersome cables, or by the use of an expensive rack and pinion.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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