Robert Davidson (inventor)

Robert Davidson was a Scottish inventor based in Aberdeen who pioneered early electric transportation technology decades before it became commercially practical. In 1839 he built what is described as the first known electric four-wheeled car, and in 1842 he followed it with the first known electric locomotive, a full-sized machine named Galvani that was tested on the Edinburgh and Glasgow Railway and reached speeds of around 4 miles per hour, making it, by the available record, the world's first electrically powered railway locomotive. Davidson combined his invention work with a separate, successful career as a chemist and dyer, pursuing his interest in electromagnetism largely outside any formal engineering institution. His electric vehicles were limited in practice by the non-rechargeable batteries available at the time and by their modest speed compared to steam power, so they did not lead to commercial adoption in his own lifetime, and electric locomotives were not put into practical railway service until the 1890s, roughly half a century after Davidson's original demonstrations, a gap that underlines how far ahead of available battery technology his engineering ideas actually were.