As President Joe Biden last week outlined the $80 billion in funding for Amtrak in his $2 trillion infrastructure package, the railway operator published a map showing all the changes it plans to make in the next 14 years.

There were high-profile new routes to Las Vegas and Phoenix in the west, and Nashville and Montgomery in the south. But experts said the most important part of the plan was the modernization of routes already in place - the ones that have been crumbling for years.

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