Yesterday, via 4chan, the internet enjoyed the story of how Fallout 3: Broken Steel's Presidential Metro car worked.The train, it was said, was actually a hat worn by an NPC who would run beneath ...

As the image above demonstrates (courtesy of a 4Chan user) the metro cars in Fallout 3 were actually hats worn by highspeed running NPCs, embedded in the ground below.

So, the truth is, in Fallout 3, you are the train. It's a pretty cool game developer trick! Check out Fallout 3's Presidential Metro cutscene in the video below (skip to the 7.55 mark).