The Roundabout consists of a circular route one-way with different entrances and exits.
| Junction Criteria |
|---|
| Cost | Cheap |
| Construction Difficulty | Easy |
| Tunnels | No |
| Bridges | No | Breakdowns
Broken down trains affect two segments up to the whole junction. |
|
| Sharpest Turn | 1.5 |
| Hills | No |
| Direct Paths | No |
| Natural Turns | No |
| Deadlock | Yes |
| Loops | Yes |
|
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Can handle up to 2 trains at a time
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When you make it bigger, you can create a 8-way roundabout
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Will cause traffic jams.
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Area: 6 x 6
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Roundabout with path based signals (PBS)
Constructing a roundabout with PBS at its entries allows multiple trains to use the junction. Since there are no signals within the loop, deadlocks become impossible.
Roundabout with path signal entries.
The goods train [A] passes the junction from the upper right to the lower left corner (1 to 3). This does neither affect the passenger train [B] (3 to 4) nor the cattle train [C] (4 to 1).
| Junction Criteria |
|---|
| Cost | Cheap |
| Construction Difficulty | Easy |
| Tunnels | No |
| Bridges | No | Breakdowns
Broken down trains affect one direction up to all but one directions. |
|
| Sharpest Turn | 1.5 |
| Hills | No |
| Direct Paths | No |
| Natural Turns | No |
| Deadlock | No | | Signal type |
PBS |
|
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Low cost, low space consumption and relatively high efficiency
|
Roundabout with PBS and bridges
This slight modification allows crossing trains not to interfere with each other.
Without bridges, both the grain [A] and steel train [B] would go through the roundabout, causing one of both trains to wait for the other one to pass by. The additional paths for trains just going straight ahead increase the roundabout's efficiency even more, without need of additional space!
| Junction Criteria |
|---|
| Cost | Cheap |
| Construction Difficulty | Easy |
| Tunnels | No |
| Bridges | Yes | Breakdowns
Broken down trains affect one direction up to all but one directions. |
|
| Sharpest Turn | 1.5 |
| Hills | No |
| Direct Paths | No |
| Natural Turns | No |
| Deadlock | No | | Signal type |
PBS |
|
Variations
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When you make it bigger, you can create an 8-way roundabout.
The same, but 8-way, roundabout concept.
Split Roundabout
This modification allows trains to pass faster.
| Junction Criteria |
|---|
| Cost | Cheap |
| Construction Difficulty | Easy |
| Tunnels | No |
| Bridges | No | Breakdowns
Broken down trains affect whole junction. |
|
| Sharpest Turn | 3.5 |
| Hills | No |
| Direct Paths | No |
| Natural Turns | No |
| Deadlock | Yes |
| Loops | Yes |
|
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Can handle up to 7-8 trains at a time
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Low possibility to cause traffic jams if there are less than 8 trains.
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Area: 33 x 33
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