Channel Tunnel (1986–1994)
Britain and France signed the Treaty of Canterbury in 1986, authorizing a privately financed rail tunnel under the English Channel. Boring began in 1988 and the link opened in 1994, connecting two national rail systems that used different operating rules and safety regimes.
Construction ran years late and costs came in far above the original estimate, forcing a financial restructuring.
It became the reference model for cross-border rail: a bilateral treaty, national financing shares, and a jointly owned operator.
The GCC agreement copies that structure, including the choice to let each state fund its own territory. The Bahrain–Saudi causeway is the Gulf's version of the same fixed-link problem.
