At midnight on October 23, 2006, the lower level transfer tunnel to the Red Line closed as part of the construction of a planned superstation under the Block 37 mall.

[3] This is the northernmost of the three stations on one long continuous platform underneath Dearborn Street, with the stops at Monroe and Jackson being the other two.

Washington is part of the CTA's Blue Line, which runs from O'Hare to downtown Chicago and Forest Park.

Blue Line trains serve Washington 24 hours a day every day; trains operate every 7 to 10 minutes during rush hour and midday operation, with longer headways of up to 30 minutes at night.

[5] There are two mezzanines for the station, Randolph-Washington, open 24 hours a day, providing a farecard transfer to the Red Line, and access to Daley Plaza.