Junction Criteria

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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


Junction Criteria

This is a list to clarify the usefulness of a junction. Every item is should be listed in all junctions as a pro or con. Use this template.

Definition of a Junction

a junction where two or more railway lines meet or cross


Sharpest turn

Cost (aprox)

  • Approximate cost in dollars ($)

Construction difficulty

  • Ease of memorizing
  • How much time it will take


  • Backup is when trains are waiting to enter the junction

Deadlock (Gridlock or Jamming)

  • Deadlock is when a train can NOT exit the junction therefor causing a backup

Elevation (Hills)

  • Trains go up or down hills while in the junction


  • Junction uses tunnels.


  • Junction uses bridges.

Natural Turns

  • Trains turn left for left.
  • (opposite) Trains must turn right to turn left. This could lead (although very rare) to trains getting lost. (Can be fixed by using waypoints)

Split before merge

  • Whether or not tracks split before they merge. (This leads to less backup if they do.)

Train Length (max or min)

  • Maximum or minimum length of a train


  • Width and Height represented as WxH


  • A lane that goes straight through without any turns
  • (Opposite) Indirect path


  • In neither, one, or two axes

U-turn and Loops

  • U-turns are fine as long as they do NOT loop around to them selves
  • Roundabout is an exception due to its design style.

Signal type

  • Original, Pre-Signal, or PBS.


  • How any one broken down train will effect the junction
  • From total shutdown to blocking one lane.


  • Single Line
    • One track
  • Single Mainline
    • One track each direction
  • Dual Mainline
    • Two tracks each direction
  • Dual Isolated Mainline
    • Two tracks each direction
    • The inner and outer tracks do not merge at any point
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