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Don Ashton’s site devoted to steam locomotive valve gears and their design, kinematics and distribution problems, particularly for Walschaerts’ and Stephenson’s gears. History and help for the smaller gauges. Please read the INTRODUCTION first.

[HOME] [INTRODUCTION] [PROFILE] [WALSCHAERTS' GEAR] [STEPHENSON'S GEAR] [OTHER GEARS] [MORE CYLINDERS] [MINIATURES] [LEAD STEAM] [SIMULATION] [DOWNLOADS] [VALVE SETTING] [FAQ] [ANIMATION] [ANALYSES] [TRACTION & MARINE]