In his 1914 ode to Chicago, Carl Sandburg referred to the city as the 'Hog Butcher for the World, Tool Maker, Stacker of Wheat, Player with Railroads and Freight Handler to the Nation'. What was true over a century ago is still true today - Chicago is the heart of America's railroads. A dizzying array of rail lines radiate out of Chicago serving as vital gateways for goods from the Midwest to the rest of the nation and the world. An amazing variety...