Show's themes mostly have to do with class, and it takes a blunt view of class struggles, showing rich exploiting poor and depicting violent revolution from the lower class. That said, the revolutionaries try to fight for equality and human rights.

Violent acts range from someone getting beat up to a riot with guns and knives. Deaths are shown, and there's a lot of blood.

Expect some romance and kissing.

"F--k," "s--t," "damn."

One story thread features fictional consumerism: A corporation created and runs the train, and money, wealth, and status are frequent motivators for the characters.

Characters drink alcohol and use (fictional) drugs recreationally.