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"Riding the rails" was people, mostly young men, who had to go looking for work but had no money for traveling, illegally hopping on trains. They would ride in empty carts, on top of the train, or even underneath clinging onto the bars. It was very unsafe but many people had no other way to move form city to city. "Jungles" were kind of like camps that were set up around towns and cities, they had a high concentration of homeless people, and were a place of refuge for hobos (the people hopping the trains). Although, they were also known to be quite dangerous at times, one had to be very careful in "jungles".
What does "riding the rails mean", and what are "jungles"?