In Europe, certainly - I can't think of any other. In Australia there are - or at least were - instances of triple-gauge trackwork: http://www.zelmeroz.com/album_rail/sa/misc/ba_gladstone3gauge.jpg working on broad, standard and narrow gauges.
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I should of course have referenced that photo to Railpictures, as Bob Avery's 170036. Apologies.
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