Posted by on August 28, 2011  Congratulations for keeping good care of these archives, and for the excellent quality of the scan Posted by Dennis A. Livesey on August 29, 2011  Snappy Sharp! That is a beauty. Posted by Gunnar Aasheim on August 29, 2011  What do they call this valve steering?It`s not Heusinger or something else. Posted by Rail Archive Stephenson on August 30, 2011  These engines has Cossart valve gear which I believe had four piston valves per cylinder operated by rotary cams. Quite unusual but clearly successful seeing as these engines lasted until 1970 without alteration.

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