> Early steam engines were developed well before the locomotive steam engine, which is generally what we associate with the term "steam engine". Atmospheric en

> Early steam engines were developed well before the locomotive steam engine, which is generally what we associate with the term "steam engine". Atmospheric engines, WP has a good description and history: https://en.wikipedia.org/wiki/Newcomen_atmospheric_engine https://en.wikipedia.org/wiki/Newcomen_atmospheric_engine