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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.

Don Ashton

Don Ashton - Photo: (c) Don Ashton's archives.

Don Ashton passed away on Easter Saturday 2020, three days short of his 81st birthday.
He will be remembered for many things, but music and engineering will be high on the list.

Don was the technical lead for the 4709 project, and there's an appreciation of his life on the 4709 project web site.