The Federal Transit Administration has agreed to provide $3.4B in funding for a rail link that will connect Caltrain—and, eventually, a new high-speed rail line to Southern California—with the multimodal Salesforce Transit Center in downtown San Francisco.

The massive project, known as The Portal, would extend the Caltrain commuter rail line by 1.8 miles, including by digging a 1.3-mile tunnel underneath downtown.

The Portal, which will take almost 10 years to complete, also will construct two new underground stations. It will connect Caltrain service at Fourth and King street to a six-level underground endpoint at the Transit Center.

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