It is no secret that many roads and railways in the US are badly in need of repairs. But there's disagreement on how to pay for the work that needs to be done.

In Chicago, where half the nation's rail freight rolls through, the tracks are so tangled that rail officials call it the  "spaghetti bowl".

It takes a freight train two days to travel the 3,000 km to reach Chicago from Los Angeles. But it can take another day or two just to get through Chicago, because passenger and freight trains share lines.

And while a transportation bill remains gridlocked on Capitol Hill, Chicago is spending billions of dollars to untangle the city's rail system.

Al Jazeera's John Hendren reports from Chicago.

Source: Al Jazeera