Stephenson valve gear

British LMS Stanier Class 5 4-6-0 Locomotive no. 44767 showing experimental Stephenson valve gear unusually mounted outside the frames
A simple Stephenson gear in partial cutoff

The Stephenson valve gear or Stephenson link or shifting link is a simple design of valve gear that was widely used throughout the world for various kinds of steam engines. It is named after Robert Stephenson but was invented by his employees.

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