Source Code (2011)

Highly decorated Captain Colter Stevens awakens in the unfamiliar form of another man. His jarring realization: he's a crucial player in a mission to uncover the perpetrator behind a devastating Chicago commuter train bombing. The perplexing truth emerges - he's a vital asset within a covert experiment, immersed in the last 8 minutes of a stranger's life. An unending loop commences as Colter relentlessly revisits the train catastrophe, each iteration adding fragments to his intricate puzzle.