The inhabitants of the Tail section plot their next rebellion. Hospitality head Melanie recruits Tailie leader Layton to assist in an investigation.
Several Tailies are punished for the attempted rebellion. Layton and Brakeman Till examine details of the first crime. A devastating accident occurs.
Layton pushes to speak to Nikki and digs into Sean’s past. Melanie and Roche learn of Kronole. A distraction is planned to ease passengers’ anxiety.
After another crime, the hunt for the suspect steps up. Layton and Melanie head uptrain to conduct interviews. The Tailies seek news on Layton.
A trial held for a suspect in the killings leads to a surprising revelation. Till celebrates a milestone. Josie sneaks away to search for Layton.
As Third Class plans to protest the verdict and Layton struggles to recover, Melanie must deal with an unprecedented emergency on the train.
Worried a dark secret about the train will get out, Melanie searches for Layton. Josie tries to see Miles, and Ruth has an unexpected rendezvous.
While First Class confronts Melanie about who’s running the train, Layton and his conspirators mount their biggest attempt to march to the Engine.
Commander Grey, Ruth and the Folgers plan an offensive strike against the rebels. Layton learns a shocking truth. Melanie, in custody, awaits her fate.
Turmoil erupts aboard the train as a leadership change takes hold. A surprise appearance brings hope to some of the passengers, but fear to others.