The AVault podcast with a Pete 'n' Emil Q&A is available. If you want to know what they have to say you'll just have to check it out yourselves, that is the harsh reality.
The only other tidbit I have to offer is this Game Culture Journal blog entry on the D.C. Metro from the perspective of a game player, game designer and D.C. resident.<blockquote>However, as technology has improved we have seen the dungeon grow into a more geographic space. This puts the Metro of Fallout 3 in a unique position: it can serve the traditional role of the dungeon while also traversing distances. Often cited as an easy example of what topological space is, the London tube map collapses representations of space into utility. Walking into a Metro station in Fallout 3, players can often find a map of the train routes. And yet, these maps are nearly worthless from a game perspective. The player is traveling along actual space with distances that correspond to the surface world, though they can become directionally disoriented.</blockquote>
The only other tidbit I have to offer is this Game Culture Journal blog entry on the D.C. Metro from the perspective of a game player, game designer and D.C. resident.<blockquote>However, as technology has improved we have seen the dungeon grow into a more geographic space. This puts the Metro of Fallout 3 in a unique position: it can serve the traditional role of the dungeon while also traversing distances. Often cited as an easy example of what topological space is, the London tube map collapses representations of space into utility. Walking into a Metro station in Fallout 3, players can often find a map of the train routes. And yet, these maps are nearly worthless from a game perspective. The player is traveling along actual space with distances that correspond to the surface world, though they can become directionally disoriented.</blockquote>