Get really serious with Washington, D.C.'s Union Station
Craft the Corridor into the Grand Arc
A landscaped terraced linear park atop a primarily underground railway and highway
Would allow expanding the railways
Would include the primarily underground extension of I-395 to a continuation to I-95 via a tunnel alongside New Hampshire Avenue to the PEPCO power line corridor.
Would include above grounding the Tiber Creek to a point just south of New Yor Avenue