Amtrak wants $7 billion to turn Union Station into a high-speed rail hub for the northeast.
The proposal to transform the terminal would double the number of trains and increase passenger traffic three-times.
Amtrak unveiled the plans Wednesday afternoon.
Much of Union Station's expansion would come below ground where Amtrak plans to add new platforms, tracks and shopping.
These areas would enjoy natural light from a 50-foot-wide, 100-foot-long glass-encased main concourse.
Amtrak Union Station Master Plan
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