"The whole train symbolizes the human society. And the carriages, from the end to the head, represents the different classes in human society. The dark and dirty rear of the train is home to the lowest class, who live on protein blocks made of cockroaches and suffer from the bullying and oppression of the upper class rulers. The middle carriage is the more intellectual and moderate middle class, while the front carriage is the decadent and extravagant ruling class. Wilford, at the head of the train, is the totalitarian ruler. He controls the engine that drives the train forward, and therefore, he controls everything. All classes in the train experience brainwashing education by the totalitarian ruler, and they worship him like a god. Except, of course, for the suffering underclass."