Patrick Klepek of MTV Multiplayer writes:
"There are many "dungeons" in "Fallout 3? that take place in Washington D.C.'s very real underground metrorail system.
For players who walk through the virtual metrorail, Bethesda Softworks has included maps that tell you a little bit about where the different routes travel to.
I snapped a picture of "Fallout 3?'s metrorail map that you're seeing above this, and wondered how it compared to the real-life version. Thankfully, there's a nicely comparable map on the metrorail's website!"