В фильме таким образом объясняется доступ в прошлые события:
Воспрос собственно каким образом получен доступ к charged electromagnetic field и этим восьми минутам short term memory? Доступ можно получить только к к этим двум вещам человека который умер или любого живого человека? Потом чисто процесс, то есть приехал на место проишествия с каким-то оборудованием и считал charged electromagnetic field а так же последние 8 минут всех мОзгов котоые прекратили свою деятельность на этом месте? Это не книга, а сценарий, если бы была книга возможно автор бы развил идею, а так предлагаю тут ее развить.Субтитры фильма писал(а): What is this Source Code?
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It's quantum mechanics parable calculus.
It's very complicated.
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Try me!
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Fine.
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When a light bulb's turned off,
there is an afterglow,
a lingering halo-like effect. You seen it?
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Yes
- Of course-
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The brain is like that, its electromagnetic field
remains charged, just briefly even after death.
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Circuits remain open.
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Now there is another peculiarity about the
brain. It contains a short-term memory
track that's approximately 8 minutes long
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like a convenience store's security
camera that only records the last portion
of the day's activity on its hard drive.
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Now combining these two phenomena,
circuitry that remains viable postmortem and
a memory bank that goes back 8 Minutes
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Source Code enables us to
capitalize on the overlap.
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Shawn Fentress died on that train, of all the
passengers aboard he was your best link.
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You two share the compatibility in terms of
gender, body size and your synaptic maps.
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What happens after the 8 minutes?
- After? Nothing.-
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You cease to exist on the train.
You cannot exist inside the Source Code,
beyond Fentress' 8 minutes.
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Source Code is not time travel.
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Rather, Source Code is time reassignment.
фильм смотрел , понравился, но все эти рассуждения "electromagnetic field/short term memory " сродну отпечатку убийцы на сетчатке жертвы 
