In the shadow of abandoned Soviet-era factories on the outskirts of Tallinn, NATO's Baltic backbone is being built with British steel and EU funds.
Bracing for sub-zero temperatures, Estonian workers are building the first leg of a 500-mile high-speed railway that aims to link the Baltic capitals to Warsaw by 2030.
Rail Baltica, a multi-billion-euro project, was originally planned as a symbol of Estonia's pro-European destiny following the collapse of the Soviet Union and its subsequent accession to the EU and NATO in 2004.
But since Russia's invasion of Ukraine in 2022, the railroad has taken on a new and important purpose.
If war breaks out between Moscow and NATO, it will be used to transport troops and equipment from the heart of Europe to the Russian border.
Now, we're going to take a closer look at the Rail Baltica project and discover all the details, including how far this important rail line reaches in the event of a Russian invasion of Europe.
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