Stephenson's link
bouch's reversing screw
Demonstration model, Great Western Railway valve gear
1920-1940
Model steam locomotive valve gear
Model of Locomotive Valve Gear
1920-1930
Sectioned Model of Steam Locomotive Valve Gear
Replica model, Howe's link motion gear
model walschaert'svalve gear
1924
corliss model valve gear
walschaerts valve gear model
1900
model howe's link motion
1842
walschaert's link
Huntley's valve gear model
1853