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By linking existing rail infrastructure, South Korea has found a way to significantly improve its national transportation network. A simple 2.9km connection between two existing metro lines in Seoul, for instance, provides international connections to cities across the country.

Completed in 2014, the new link gives South Korean high-speed trains (KTX) - and thereby most of the country's population - direct access to Incheon International Airport, one of the busiest in the world.