The Diolkos(Δίολκος, from theGreekδιά,dia"across" and ὁλκός,holkos"portage machine") was a paved trackway nearCorinthinAncient Greecewhich enabled boats to be moved overland across theIsthmus of Corinth. The shortcut allowedancientvessels to avoid the long and dangerous circumnavigation of thePeloponnesepeninsula. The phrase “as fast as a Corinthian”, penned by the comic playwrightAristophanes, indicates that the trackway was common knowledge and had acquired a reputation for swiftness.
The main function of the Diolkos was the transfer of goods, although in times of war it also became a preferred means of speeding up naval campaigns. The 6 km (3.7 mi) to 8.5 km (5.3 mi) long roadway was a rudimentary form of railway, and operated from c. 600 BC until the middle of the 1st century AD. The scale on which the Diolkos combined the two principles of the railway and the overland transport of ships remained unique in antiquity.