The world's longest transportation (in this case rail) tunnel is the english channel tunnel, or "channel," connecting dover, england, and calais, france. The chunnel consists of three separate, adjacent tunnels. Its length is approximately 50 kilometers.

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Answer Channel Tunnel likewise called Eurotunnel rail burrow among England and France that runs underneath the English Channel The Channel Tunnel 31 miles 50 km long comprises of three passages two fo... View the full answer