Flying junction

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A flying junction is a railway junction at which multiple lines fly over or dive under each other, without crossing on the level.

A flying junction accomplishes this separation by means of grade separation, having individual tracks rise and/or fall to pass over or under other tracks. Simple flying junctions may have a single track pass over the main line to avoid conflict, while complex flying junctions may have an elaborate infrastructure to allow multiple routings among a variety of tracks without trains coming into conflict, in the manner of a highway stack interchange.

The opposite of a flying junction is a level junction, where tracks cross at grade and routings must be controlled by signals and an interlocking plant.