I posted this in the Gameday Thread, but upon reflection it's significant enough to warrant a more prominent posting:
Per WMATA.com and Dr. Gridlock's blog, all Metrorail trains are restricted to 15 mph until further notice while they inspect all the tracks throughout the entire system. Allow extra time if you plan to take the subway to the game tonight. In fact, you best be on your way already (it's 5:01 PM as I type this). Reports are that all the downtown stops are mobbed.