Freight hoppers, also known as hobos, are people who travel by freight train, often in search of work. They typically carry all their possessions with them and hop on and off the trains to get from one place to another. Freight hoppers have been a part of American culture since the late 19th century, when they were seen as a symbol of the struggles of the working class. Today, freight hoppers are still a common sight in many parts of the United States.