Looking for a movie. HELP PLEASE?

OK i cannot remember the title of this movie. OK this is what i remember from a trailer i remember seeing a long time ago. There are these people in a train. I believe a bomber bombs the train and a certain man replays that moment and keeps coming back to life trying to prevent the dieing from happening. But then he decides to screw it and trys to save this one women.. Please help me find this title of the movie. It came out this year 2011. I think somewhere between Jan-March. But i cold be wrong. Help!