Audio problem: This scene is repeated multiple times in the movie: usually when the main character enters the "source code" the scene begins by panning over a small pond showing a Canada goose taking flight. However the sound editor makes the mistake of dubbing in a recording of a hen mallard duck.
Source Code (2011)
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Directed by: Duncan Jones
Starring: Jake Gyllenhaal, Vera Farmiga, Jeffrey Wright, Michelle Monaghan
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Colter Stevens: It's the same train, but it's different.
Trivia: The voice of Jake Gyllenhaal's father is Scott Bakula, who starred in Quantum Leap, which shares the premise of being in another person's body with this movie.
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Chosen answer: Trains that shuttle back and forth on shorter stretches don't usually turn around at the terminus. They simply go "backwards". So, in one direction the loco is in the front, on the way back it's at the end of the train.
Ioreth