Star Junction

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OpenTTD Manual

Installation · Tutorial
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

Over-Under

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

Star junction (bridges)

Junction Criteria
Cost Moderate Construction Difficulty Moderate Tunnels Optional Bridges Optional Breakdowns Broken down trains only affect the one track.	Sharpest Turn 2 Hills Yes Split Before Merge Yes Direct Paths No Natural Turns Yes Deadlock No Loops No Signal type Any
Handle a large number of trains at a time. Some branches are shorter than others, which may cause some trains to wait unnecessarily. Tips Start by building the bridges or tunnels. Resize to make each branch long enough to hold a complete train. Make it smaller. You can save one square under the bridges. Use a combination of bridges and tunnels to keep bridge/tunnel length to three tiles (including bridgeheads or entrances) Area: 14 x 14

Variations

Star with Tunnels

Star junction (tunnels)

Industrial Star

This variation is compact but not especially fast. There are no right-angle turns but left turns are one-tile double bends limited to 55 MPH (88 km/h), as in most less-complex junctions. It is intended to carry a heavy load of industrial trains with great variation in train lengths.

This is a right-hand-running image with signals on the drive side. All signals are standard path except for a single one-way path at each entry. The signaling shown hustles trains through closely, without regard for the possibility of blocking other trains; a more conservative scheme would have fewer signals inside the junction, or none. A combo or block scheme is also possible.

A sufficiently long train (about 11 tiles), making a left-hand turn from, say, the NW-bound main to the SW-bound, that breaks down just after it reserves its exit to the main; can block all traffic NW and SW straight, SE to SW, NW to NE, and of course trains following NW to SW. That is 5 of the possible 12 routes through the junction, the maximum disruption. Shorter trains are able to block fewer routes. Of course, a blocked train may block others, aggravating any jam. Deadlocks, in which a train blocks its own exit or two or more trains block one another's exits, are impossible.

This image reveals the areas underneath the bridges.

Junction Criteria
Cost Moderate Construction Difficulty Moderate Tunnels No Bridges Yes Breakdowns Broken down trains affect at most 5/12 of routes.	Sharpest Turn 1 Hills No Split Before Merge Yes Direct Paths Yes Natural Turns Yes Deadlock No Loops No Signal type Any
Can be used on a mainline Area: 9 × 9

Sunken Star

This has the same character as the Industrial Star but is often faster. Engines pulling up and out of the well may have momentum left over from rolling down and in. Also, while the engine is on the upgrade, cars may be on the downgrade, assisting. This is especially kind to through trains.