Flying junction Totally Explained

Everything about Flying Junction totally explained

A flying junction is a railway junction at which one or more diverging or converging tracks in a multiple-track route cross other tracks on the route by bridge to avoid conflict with other train movements. A more technical term is "grade-separated junction". A burrowing junction or dive-under is where the diverging line passes below the main line.
The alternative to grade separation is a level junction or flat-junction, where tracks cross at grade and conflicting routes must be protected by interlocked signals.

Complexity

Simple flying junctions may have a single track pass over or under other tracks 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.

High-speed rail

Nearly all junctions leaving or joining high-speed railways are grade-separated. On the French LGV high-speed network, junctions allow 300km/h+ (normal linespeed) along the direction of the mainline, and a limit of 160km/h for the diverging path.
The LGV network is large enough to contain four fully grade-separated high-speed triangles: Fretin (Lille), Coubert (south-east Paris), Messy (east of Paris) and Angles (Avignon). A fourth triangle, Vémars (north-east Paris) is grade-separated except for a single-track link on the least-commonly used side (southern end linking Paris Gare du Nord to Paris CDG airport).

Examples

Weaver Junction near Northwich, Cheshire, UK (External Link)
Aynho Junction in Aynho, Northamptonshire, UK
Central Station in Sydney, Australia
TGV Triangles
Triangle de Fretin, Lille, France. Connecting Paris, Brussels and London. (External Link)
Triangle de Coubert, Paris, France. (External Link)
Triangle des Angles, Avignon, France. With two parallel 1.5km viaducts. (External Link)
"Triangle de Messy", Paris, France. Partial four-way junction. (External Link)
Triangle de Vémars, Paris, France. (External Link).

Further Information

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