student asking question

Is it "train of something" a common expression?

teacher

Native speaker’s answer

Rebecca

The phrase "train of thought" is actually a common expression but here it is also used as a literal name for the train. "Train of thought" is an expression that is used to refer to the process of someone's thinking or the series of ideas or thoughts that someone has. Ex: He interrupted my train of thought. Ex: I just had a weird train of thought.

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