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A phrase used by railfans to designate when the headlights of an approaching train are visible glinting off the [railroad tracks] ahead of the train around a corner, usually before the train itself is visible. Strictly, it is a “quiet [on the set]”, as the headlight glint warns of an approaching train and allows a few seconds for [background noise] to be minimized for when the train actually appears. This provides railroad enthusiasts with pristine sound in their videos of the passing train. Pragmatically, it is a way for dorky train nerds to dorkily tell other dorky train nerds “ooh, a twain is coming!”
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