train of thought
Similar to the subway of unconsciousness and the airplane of logic, the train of thought is used to casually describe one's thought process. It is usually lost, sometimes derailed, frequently hijacked, and has been known to reverse course. Also, the train of thought is never stated to have a beginning or an end, and it is unknown whether there are any passengers on board.
train of thought by dan.s August 17, 2008
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