Recent Blogs
Valve Motion Eccentric
How the Valve Motion Eccentric converts crankshaft rotation into slide-valve linear motion on steam locomotives, mill engines, and traction engines.
Variable Expansion Gear
Variable expansion gear lets a steam engine vary cutoff on the fly to match load. Learn how the mechanism works, sizing math, and worked example...
Single D Slide Valve
Single D slide valve explained — how it ports steam to a cylinder, lap and lead settings, and worked timing examples for heritage steam locomotive...
Reversing Gear for Single Engine
Reversing gear for a single steam engine — how Stephenson, Walschaerts and slip-eccentric link gears reverse rotation, set cut-off and serve locomotives and launches.
Gooch Valve Gear
Gooch valve gear explained — how Daniel Gooch's stationary-link reversing gear controls steam admission in locomotives, with formula, worked example and tradeoffs.