Both Sides, Now (S05E01)

The 126 springs into action when a gang of masked individuals ambushes an armored truck and its security detail. Meanwhile, Carlos, now a Texas Ranger, takes on the investigation. Owen joins Tommy in group therapy to process the grief from his brother Robert's passing. Marjan and Paul both vie for the lieutenant position left vacant by Judd, who is struggling to adjust without his former role. Wyatt starts his new job at the call center, and a devastating train derailment brings a wave of tragedy.