3∕4ths junction
OpenTTD Manual
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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

This junction is pretty easy to make, but is not complete and so trains can get lost. Trains can go from NW to SW and SE to NE, but can not return.

3/4ths junction

Junction Criteria
CostCheap
Construction DifficultyEasy
TunnelsOptional
BridgesOptional
Breakdowns
Broken down trains affect at maximum 2 tracks. Example: On the southern right turn from SW to SE also the left turn from NW to NE is blocked (and the straight track from NW to SE, but that has at that point already joined the southern track).
Sharpest Turn2
HillsYes
Split Before MergeNo
Direct PathsYes
Natural TurnsYes
DeadlockNo
LoopsNo
Signal type Any
  • Trains arriving from northeast or southwest are unable to turn left.
  • Small
  • Slope only in the one way of railway
  • Useful for fast, serial construction
  • Trains in line direction are not slowed, or slowed only a bit and are not blocked themselves