Double 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
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

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

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

Contents

4-way 4-track Clover-in-Clover

An extended version of the Cloverleaf for mainlines tracked AABB style (indicating the direction trains run in). This junction use tunnels instead of bridges, because tunnels don't have speed limits. As you can see on the image below, there are two tracks leading into the junction and two leading out: the whole reason for a double cloverleaf is to allow more traffic to flow through your line if you have a 4 track mainline.

A double cloverleaf 4 way junction (horizontal extent 24; verical extent 24; needs 396 squares)

Pros

  • Double tracked, holds twice the number of trains
  • Can handle a large number of trains at the same time.
  • Uses separate tracks so trains wont interfere with each other too much.

Cons

  • Branching after merging: Very likely to enter a deadlock state.
  • Extremely large
  • Trains have to slow down when climbing a slope
  • Trains have to turn right to turn left. This could lead to trains getting lost. (Can be fixed using waypoints)
  • Doesn't have a direct path so that trains travel extra far to turn left.
  • Costly to build
  • Difficult layout to remember and to build

Variations

A double cloverleaf 4 way junction without sharp corners, easier to remember, and more looking like a clover leaf.
A double cloverleaf 4 way junction without sharp corners than the above, a little harder to remember, and more looking like a clover leaf.

6-way 2-track Double Overlap Clover

Taking two cloverleaf junctions and overlapping them together produces a 6-way junction. This is similar to the 4W4T clover, except that the mainline is signalled ABAB-style rather than AABB (train direction per track) and that trains can change over (an expensive operation the path finder tries to generally avoid).

It has the same extent as the Clover-in-Clover (24×24). Without the direct right turns, the extent shrinks to a compact box of 20×12.

6-way double cloverleaf

8-way 2-track Quad Overlap Clover

Taking four cloverleaf junctions and overlapping them together produces an 8-way junction. (Again, if one ignores the space, it is a 4-way 4-track interchangeeven though the double tracks are separated by a void of 6 squares, combining them likewise, an 8-way junction can be obtained. This is similar to the 4W4T cloverleaf in that, when one considers the two 2-tracks , and handy when the mainline tracks are signalled ABAB style (indicating direction trains run in) rather than AABB.

6-way double cloverleaf
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