WStephenson valve gear
WBaguley valve gear
WBaker valve gear
WBulleid chain-driven valve gear
WCaprotti valve gear
WGab valve gear
WStephenson valve gear
WGresley conjugated valve gear
WHackworth valve gear
WWalschaerts valve gear
WHolcroft valve gear
WJoy valve gear
WKuhn slide
WPiston valve (steam engine)
WValve gear
WSouthern valve gear
WStephenson valve gear
WValve gear
WWalschaerts valve gear