Amtrak is proposing an ambitious expansion of its rail network across the country as part of President Joe Biden's infrastructure goals, including increased service through Worcester. Amtrak didn't release additional details but highlighted in its national plan on Wednesday new rail service along an existing route running from Boston through Worcester to Springfield and Albany. Today, those cities form the easternmost part of Amtrak's Lake Shore Limited route whose western end is in Chicago. Wednesday's announcement from Amtrak accompanied Biden's $2-trillion infrastructure plan, including $80 billion for rail, a soft spot for a president known for regularly taking Amtrak between Washington, D.C. and his home in Delaware in his decades in the Senate. The plan, Amtrak said, would bring new and better train service to millions of new passengers.