Hiram Carrero was charged with federal arson for allegedly igniting a fire on a subway train that severely injured a sleeping passenger.Prosecutors said Carrero lit paper and dropped it near the victim, causing critical burns, before fleeing and later being arrested in Harlem.If convicted, Carrero faces at least seven years in prison, and his lawyer Jennifer Brown highlighted both the seriousness of the charge and Carrero's lack of a criminal record.