In 2006, Mike Brodie dropped out of high school and, for the next three years, rode 50,000 miles for free on freight trains all across the US.
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He took thousands of photos of his travels, which have since been published in a book and exhibited at galleries around the world.
He says the transient lifestyle is a protest, and estimates some 2,000 to 5,000 people still take part in this secretive activity in the US.
Part of the Rulebreakers series from BBC World Service in collaboration with Sundance Institute.
Producer: Rachel Kantrowitz