Irrational Games has released a developer diary that outlines some of the history behind the "Sky-Lines" in BioShock Infinite.

As explained by Ken Levine, the rail lines that connect sections of Columbia--the game's set-piece floating city--were originally intended to be used for transport of goods. Evidently, a bunch of pesky kids realized they could use the Sky-Line for personal transport and, as the city began to self-destruct, a new method of travel was born. Read more »

We're treated to a splendid tour of BioShock Infinite's setting in the E3 trailer, as former Pinkerton protagonist Booker Dewitt swings through the sky-city Columbia on its sky-line rail transport, dispatching ruffians as he goes. There's a young lady relying on him to rescue her, you see.

BioShock Infinite is headed to PC, Xbox 360 and PlayStation 3 in 2012, developed by Irrational Games and published by 2K Games. Check out our early E3 preview for Infinite fun. Read more »