If containerships are the cheapest way to transport cargo, why aren’t we using canals instead of railways and highways to transport goods over land?

Question

If containerships are the cheapest way to transport cargo, why aren’t we using canals instead of railways and highways to transport goods over land?

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Answer 1

Cheaper to build railways, cheaper still to build roads. Go check out stuff on the Suez and Panama canals to learn the economic reasons and the sheer scale of the job.