The Diolkos, from the Greek dia “across” and olkos “portage machine” was a paved trackway near Corinth in Ancient Greece which enabled boats to be moved overland form The Corinthian to the Saronic Gulf across the Isthmus of Corinth. This shortcut allowed ancient vessels to avoid the long and dangerous circumnavigation of the Peloponnese peninsula. The phrase “as fast as a Corinthian”, penned by the comic playwright Aristophanes, 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.
Please spend some time to watch the following explanatory video produced by the Tech Chamber of Greece (EMAET).