You have a choice. There is a light rail that runs between BWI and downtown Baltimore. There is also MARC and Amtrak service that runs between the two.
The light rail is cheaper, and pulls right into the airport, but makes a lot of stops. It does take you right into downtown.
To get to the MARC and Amtrak trains, you take a shuttle bus to the train station. MARC is cheaper but takes a bit longer than Amtrak. MARC doesn't run on weekends, though. Also, Amtrak and MARC come into Penn Station in Baltimore, which is a bit removed from downtown.
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