What was unique about the American railway unions structure?

history of 3,000 workers, organized in the American Railroad Union (ARU), walked off the job. An effective nationwide boycott of Pullman cars by ARU members was organized by the union to support the strike. By June 30, 125,000 American railway workers on 29 railroads had quit work rather than handle Pullman cars.

the correct answer is individualism and exchange. at this stage, children begin to question the rules, because they can see that there is more than one side to them. different individuals have different viewpoints. they won't be able to reach this stage because of ignorance, a lack of ethics or personal biases. that is because people with that characteristiscs are not able to distinguish what is good or what is bad and they can't pursue their individual interests.

can you explain it better