Two articles about valves and vale motion from 1906 editions of Railway Locomotive magazine.
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railwaylocomotiv19newyuoft_0118....1 1906.jpg (207.96 KiB) Viewed 411 times
railwaylocomotiv19newyuoft_0119....2 1906.jpg (237.4 KiB) Viewed 411 times
railwaylocomotiv19newyuoft_0120 1906 3.jpg (238.31 KiB) Viewed 411 times