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W E D N E S D A Y

For those who yearn to tromp the Metro system’s subterranean passageways without the hassle of oncoming trains, there’s the National Building Museum’s METRO: Green Line tour, during which a Metro representative will lead participants through the tunnel connecting the Fort Totten and Georgia Avenue-Petworth stations. Adventurous souls should ask permission before touching the third rail. At noon today and March 22. $7. For reservations and location call (202) 272-2448. (Steve Kuhn)