Photographer Mike Brodie, also known as The Polaroid Kidd, began photographing his travels in 2004, taking thousands of photos of people illegally riding freight trains during his five-year project. The photos are extremely intimate, showing the hidden world that exists along the rails.

Brodie began shooting his photos for the series, titled A Period of Juvenile Prosperity, with an old Polaroid SX-70, but switched to an 80s Nikon two years later. You can also purchase Brodie's book of the same name.

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Scaling fence

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Sleeping couple

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Sleeping

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The photos are courtesy of Yossi Milo Gallery and Mike Brodie.