Dual Branch-Merge Junction

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Railway Junctions
Junction Criteria

3-Way junctions

Basic 3-Way
Line Merge
Half Cloverleaf
Half Spaghetti
Compact 3-Way
Compact 3-Way B-M Junction
Ultimate 3-way
Half Transmogrified
Braided Junction

4-Way junctions

Basic 4-Way
Complex Star
High Speed 4-Way Fly-over/under
Pre-Signaled Roundabout
Advanced Roundabout
Right-of-way Roundabout
Improved Roundabout
Deepblue2k8 4-way Junction

Enormous junctions

Multi-way/multi-track cloverleaves
Dual Tetrathorp
Dual Transmogrified
Dual Branch-Merge
Quad Branch-Merge
Quad Tetrathorp
6-tuple Branch-Merge
8-Way Star
High Speed 4-way

Other junctions

Right-of-way Depot
Dual tunnels
Sideline U Turn
Right-of-way Lane Change
Right-of-way Merge

Track Layouts

4-Way Triple Axial
4-Way Triple Axial 2
Triple Via Mini
High Hill

Unuseful junctions

3/4ths junction
Ultimate 3-way junction for 4 tracks

The Dual Branch-Merge Junction is a high speed, high traffic junction. It branches at the beginning of the junction and merges right at the end, allowing more trains into the junction at once, thus preventing deadlock; it does not use sharp turns in order to maximize speed; it has a maximum of two slopes per path. Trains heading straight, turning right, or turning left all have dedicated tracks, which help alleviate traffic.

This junction works best with realistic acceleration and if trains can choose between the inner and outer tracks just before entering the junction.

This junction is built for speed at the cost of space.

A Dual Branch-Merge Junction (left side traffic version)
A Dual Branch-Merge Junction (right side traffic version)


  • Handle a large number of trains at a time.
  • Traffic jams are unlikely.
  • Trains don't have to loop around like they do in a cloverleaf.
  • Tracks split before they merge, avoiding traffic problems.


  • Trains have to slow down to climb slopes.
  • Takes up a huge amount of space.
  • Very complex and costly to build.
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