She is portrayed by Katie McGuinness. She is a strong, no-nonsense woman who lives in poverty at the tail of the train. Josie's downfall at the hands of Melanie Cavill is a mere example of the extreme lengths Cavill will go to protect her secret. In Season 2 , it's discovered that Josie is actually still alive, severely frostbitten, and labeled as a Jane Doe in the Second Class Clinic.
Little is known about her early life other than that she was a vet before The Freeze. She does not have a ticket to Snowpiercer and lives in the Tail. Josie is first presented as one of the leaders among the Tail along with Andre Layton.
When Andre is taken upfront to solve Sean Wise's murder, however, she receives backlash from the Tailies as they believe they have been betrayed by Layton. Despite the revolt against her in the Tail, she remained an integral part of the revolution and actively engages when the planning was in process. She further participated when Pike ordered that the revolution was to go ahead. Following this, she was happy to see that Layton had not betrayed the Tail, but was actually working uptrain to gather blueprints and other information that would aid in their revolution.
Using an access chip passed to her by Layton, Josie moves around the train undetected during sanitation work hours. She speaks with Astrid about Layton and is told that he has solved the murder but has not yet returned to the tail.
Josie becomes worried when nobody is able to locate Layton and suspects that he has been suspended within the drawers. She actively goes looking for him and finds him in one of the drawers but is caught by John Osweiller. After learning that Miles has been selected as Melanie's newest engineer apprentice, she feeds him a mild poison so that he ends up in the infirmary where Josie can contact him.
