Half Cloverleaf

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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 half cloverleaf is, also known as a trumpet interchange, as its name suggests, half of a cloverleaf junction. Trains have to do some looping.

Half Cloverleaf Junction
Half cloverleaf junction with only 1 loop


  • Can handle a large number of trains at a time.
  • Traffic jams not likely.


  • Trains must slow down to climb a slope.
  • Trains join the main line before leaving. This could cause traffic problems. (Not applicable to the 1 loop design)
  • Trains must turn left to go right. This could lead to trains getting lost. (Can be fixed by using waypoints). This is no longer an issue with newer OpenTTD versions that use a more advanced pathfinder.


  • Make the loops bigger and without sharp turns.
  • Make one of the loops go the other direction, so the train doesn't have to loop around.
  • Make the branches bigger to hold a complete train, so trains that are waiting at a red signal aren't blocking other trains.
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