BWI Airport station is a train station located in an unincorporated area within Anne Arundel County, Maryland. It is served by Amtrak intercity services (frequent Northeast Regional and Acela Express trains plus the daily Vermonter and Palmetto) and MARC Penn Line regional rail service.The station is located on the airport complex just over a mile from the main terminal of Baltimore-Washington International Thurgood Marshall Airport. A free shuttle bus runs between the station and the airport terminal every 6 minutes from 5 am to 1 am and every 25 minutes from 1 am to 5 am.HistoryThe station was dedicated on October 23, 1980, and was the first intercity rail station in the U.S. built to service an airport. BWI Rail Station opened for Amtrak intercity and Conrail commuter trains on October 26, 1980.The station's building houses a ticketing desk, waiting room, and a concessions area. The adjacent parking garage is used by commuters who ride the train to work in Baltimore or Washington, and also contains the bus stop for shuttles to the BWI terminal. The garage was built in the late 1990s to replace a smaller surface lot. It contains 3,200 parking spaces and typically does not fill to capacity. The Carolinian served the station between 1991 and 2004.