The first self-propelling <a href="https://en.wikipedia.org/wiki/Steam_locomotive" id="mwMg" rel="mw:WikiLink" title="Steam locomotive">steam locomotive</a> makes its outing at the <a href="https://en.wikipedia.org/wiki/Penydarren_Ironworks" id="mwMw" rel="mw:WikiLink" title="Penydarren Ironworks">Pen-y-Darren Ironworks</a> in Wales.