Egide Walschaerts

Egide Walschaerts did not invent his famous valve gear in a university lab, but on the gritty shop floor of the Brussels-Malines railway. Starting as a modeller, his genius for three-dimensional mechanical design was evident early on, so much so that a government minister secured him a spot at Liège University. Yet his true education came from the machinery itself. As a foreman at the Brussels workshop, he tackled the practical problem of efficiently admitting steam to a locomotive's cylinders. In 1844, he devised a solution of sublime simplicity and robustness: a system of levers and rods driven directly from the main piston's crosshead. The Walschaerts gear, as it became known, was more reliable and easier to maintain than its rivals. Its adoption was slow at first, but by the 20th century, it was moving the pistons of the vast majority of the world's steam locomotives, a lasting tribute to practical engineering brilliance.