Which is a 370 miles (600 km) long bi-national waterway first proposed in the 1890s, started in 1954 and opened in 1959?

Question

Opened in 1890, with 6 stations over 3.2 miles (5.1 km) and running in a pair of tunnels between the City of London and Stockwell passing under the River Thames, what was the first deep-level underground "tube" railway in the world, and the first major railway to use electric traction?

Answer 1

St Lawrence Seaway
The Seaway is a system of locks, canals, and channels in Canada and the United States that permits oceangoing vessels to travel from the Atlantic Ocean to the Great Lakes of North America.