Beginning as early as 600 B.C., the ancient Greeks created an ambitious road partially paved with stone, that spanned across the entire Isthmus of Corinth to haul boats or cargo from one port to the other, to avoid a 220 mile voyage over water

The Diolkos varied from 15 to 20 feet wide and was paved with porous limestone. Some stone blocks were taken from abandoned monuments and archaic Greek letters were still visible. The Diolkos stretched for about 5 miles because it was built around the landscape to ensure a consistently mild inclination of less than 1.5 percent. No trace remains of the eastern portion and the exact terminus is unknown.

https://www.history.com/news/ancient-railway-greece-diolkos

https://arkeonews.net/ancient-greeks-built-a-road-to-haul-cargo-overland-the-father-of-the-railway-diolkos/