Colter Stevens: How's everything today?
Conductor: It's good.
Colter Stevens: Anything out of the ordinary?
Conductor: [confused] No.
Colter Stevens: I meant uh...behavior on the train. Is anything...anybody seem strange to you?
Conductor: You're a little strange.
Colter Stevens: How about you, does anybody look suspicious?
Christina Warren: Are you dunk or something?
Colter Stevens: Come here?
[she looks at him confused]
Colter Stevens: Just for a second.
[she looks at him suspiciously]
Colter Stevens: Come on!
[she comes over and sits next to him]
Colter Stevens: Just think of it as a game.
Christina Warren: A game? Wow!
[she looks around at the other passengers]
Christina Warren: There all so utterly normal, Sean. That's what so terrifying about them. Maybe there's a team at work.
[she looks around referring to the passengers she sees]
Christina Warren: The sleeping giant coach. The minister sudoku. Don't forget the sullen college kid, he's expendable. But they're all controlled by the conductor. Standing there all dictatorial, demanding tickets.
Colter Stevens: You're funny.
Colleen Goodwin: Captain, it is going to be counter productive for you to try to save anyone on that train. They are outside submission.
Colter Stevens: Well...but she survived. And maybe the rest could too.
Dr. Rutledge: She survived, but only inside the Source Code. None of them can be saved.
Colter Stevens: What is...what is the Source Code?
Dr. Rutledge: It's uh...quantum mechanics, parabola calculus. It's uh...it's...it's very complicated.
Colter Stevens: Try me!
Dr. Rutledge: Fine. Uh...when a light bulb turns off, there's an afterglow, a lingering halo-like effect. You seen it?
Colter Stevens: Yes.
Dr. Rutledge: Of course. The brain is like that. It's electromagnetic field remains charged, just briefly, even after death. Circuits remain open. Now, there's another peculiarity about the brain. It contains a short term memory track, that's approximately eight minutes long. Like uh...a convenient store security camera that only records the last portion of the days activity on its hard drive. Now in combining these two phenomena, circuitry that remain viable post-mortem, and a memory bank that goes back eight minutes, Source Code enables us to capitalize on the overlap. Sean Fentress died on that train. Of all the passengers aboard, he was your possible link. You two share compatibility in terms of gender, body size and your synaptic maps.
Colter Stevens: Why?
Derek Frost: Oh. You mean...you mean why this?
[pointing to his explosive device]
Derek Frost: Because, the world is hell. But we have a chance to start over in the rubble. But first there has to be a rubble. You're a teacher, you know that. You understand.
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