An alternate timeline is a world line that is created by temporal interferences in the "past".

Spoiler warning: This article may contain plot details
about an upcoming Journeyman episode.

Unintentional interference

In 1987,Dan Vasser pushes Neal Gaines out of the way who stood in the middle of Market Street from incoming F-Line Rail train.

Intentional interference

In 1997, Dan stops Neal Gaines from killing his wife and their son.

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