Branch-Merge Junction
OpenTTD Manual
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FAQ · Game Interface
Readme.txt
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
Roundabout
Cloverleaf
Spaghetti
Star
Complex Star
Branch-Merge
Tetrathorp
High Speed 4-Way Fly-over∕under
Pre-Signaled Roundabout
Advanced Roundabout
Right-of-way Roundabout
Improved Roundabout
Transmogrified
Tightlong
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
Building depots
Dual tunnels
Sideline U Turn
Right-of-way Lane Change
Priority Merge
Track Layouts
4-Way Triple Axial
4-Way Triple Axial 2
Triple Via Mini
High Hill
Unuseful junctions
Crossover
3/4ths junction
Ultimate 3-way junction for 4 tracks

The Branch-Merge Junction is a small improvement over the Complex Star Junction. It branches right at the beginning of the junction and merges right at the end, allowing more trains into the junction at once while preventing deadlock; it uses tunnels instead of bridges so that maximum speed is not limited; it has fewer slopes per path (middle two left turn tracks do not need to climb slopes); and it also has a more direct path. Trains heading straight, turning right, or turning left all have dedicated tracks, which helps alleviate traffic. However, trains heading straight need to first turn right and are also slowed down by a hill. This junction is built for speed at the cost of space.

Branch-Merge Junction

Junction Criteria
CostExpensive
Construction DifficultyVery Hard
TunnelsYes
BridgesNo
Breakdowns
Broken down trains only affect the one track.
Sharpest Turn1
HillsYes
Split Before MergeYes
Direct PathsNo
Natural TurnsYes
DeadlockNo
LoopsNo
Signal type Any
  • Handle a large number of trains at a time.
  • Very sharp turns, which could affect speed.
  • Area: 19 x 19