Leave it to Hollywood to start the zombie apocalypse.

When Infinity Pictures leases an entire passenger train to film its latest blockbuster, the cast and crew of the zombie action movie Hart Throbbed climb aboard for an express ride to hell, compliments of a nefarious Breckenrock subsidiary illegally transporting damaged spent fuel rod containers from the local nuclear reactor facility. With only hours to retake their runaway train, Jason Hart and the rest of the cast take a crash course in method acting by battling for survival against patient zero and the horde of zombies spawned along the way. In this prequel to the Plagued States of America series, the origins of zombie half-breed Penelope Hope are finally known.