I didn't even think of this, since WAS is my home station and with the NEC routes, it's open 24 hours. When I was traveling to Montreal a few years back, I just took a late-night Metro train down and waited for the early AM NEC without issue.Just curious, if a late running train arrives at Chicago Union Station during the hours it is closed, 11:59 PM to 5:30 AM, are the passengers allowed to remain in the building if they have a connection with a train departing later or to summon a taxi? Or does security just escort the passengers to an exit? I've changed trains in Chicago several times but always during regular business hours.
Are WAS, NYP, and (presumably) LAX the only stations open all night? I'd hope that at least some of the West Coast stations are as well with the lengthy commutes for many to be able to afford rent/mortgages.