![]() The first application in Britain was on a Single Fairlie 0-4-4T, exhibited in Paris in 1878 and purchased by the Swindon Marlborough & Andover Railway 1883. The Mason Bogie locomotive type was the first to use the Walschaerts gear in North America. ![]() The Walschaerts gear had the advantage that it could be mounted entirely on the outside of the locomotives, leaving the space between the frames clear this caused adoption first among some articulated locomotives. The Stephenson valve gear remained the most popularly used valve gear on 19th-century locomotives. It was extensively used in steam locomotives from the late 19th century until the end of the steam era. The gear is sometimes named without the final "s", since it was incorrectly patented under that name. ![]() The Walschaerts valve gear is a type of steam engine valve gear invented by Belgian railway mechanical engineer Egide Walschaerts in 1844.
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