The line would be part of the president's sweeping $2.3 trillion plan.
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Following Wednesday's announcement by Biden, Amtrak released plans for updated service throughout the U.S.
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A link to Phoenix or Tucson from the Southland is also part of the plan.
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"With @POTUS's infrastructure plan, Amtrak will create jobs and improve equity across the country, and we are ready to deliver," Amtrak tweeted in response to the infrastructure plan. "America needs a rail network that offers frequent, reliable, sustainable and equitable train service. Now is our time, let's make rail the solution."