Difference between revisions of "Presignal Basics"

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{{delete|We don't need this, link to this instead: http://wiki.openttd.org/Signals#Pre-signals}}
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[[Guides:Presignals|^^ Back to Presignals Guides Index]] | [[Oneway_or_Twoway_Presignals|Oneway or Twoway Presignals >>]]
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=<center>Presignal Basics</center>=
 
=<center>Presignal Basics</center>=
 
The Presignal Basics is explained here: how they work, how they behave, and how does work a terminal station, and whats the use of the combo presignal.
 
The Presignal Basics is explained here: how they work, how they behave, and how does work a terminal station, and whats the use of the combo presignal.
  
 
==Part 1: Identify the signals==
 
==Part 1: Identify the signals==
There is five type of signals in OTTD. If you click on a normal signal with CTRL is held, these signals will appear:
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There are six types of signals in OTTD. If you click on a normal signal with CTRL is held, these signals will appear:
  
-Normal Signal: It doens`t have any special alibity, it turns to red if the next signal block is blocked by any train.
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'''Normal Signal''': It does not have any special alibity, it turns to red if the next signal block is blocked by any train.
  
-Entry Presignal: It works like a normal signal, plus it turns to red if all exit presignals, or combo presignals are red after it.
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'''Entry Presignal''': It works like a normal signal, plus it turns to red if all exit presignals, or combo presignals are red after it.
  
-Exit Presignal: It works same as normal signal, but it signs for the entry, or combo signals, if self is red.
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'''Exit Presignal''': It works same as normal signal, but it signs for the entry, or combo signals, if self is red.
  
-Combo Presignal: It have Entry and Exit presignal alibities both: It turns to red if all Exit/Combo are red after it, and it signs for the Entry/Combo Presignals, if the self is red.
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'''Combo Presignal''': It has both Entry and Exit presignal alibities: It turns to red if all Exit/Combo are red after it, and it signs for the Entry/Combo Presignals, if the self is red.
  
-PBS Signal: Not a Presignal, it enables more trains in one signal block, since PBS means Path Based Signaling. This type of signal isnt explained here.
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'''PBS Signal ''': Not a Presignal, it enables more trains in one signal block, since PBS means Path Based Signaling. This type of signal is not explained here.
  
You can see how they looks like [[:image:Signals.PNG|here]].
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'''One-Way PBS Signal ''': It works like a PBS Signal, however, it prohibits passing through from the back side. This type of signal is not explained here.
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[[Image:Signals_revised.png|thumb|center|388px|Different signal types]]
  
 
==Part 2: The Station Problem==
 
==Part 2: The Station Problem==
Stations without any presignals have a big problem: just have a look on [[:image:Terminal1.png|this Terminal Station]]. If you let one more train to enter into the station it will block the exit, because A signal is green. This problem is solvable with presignals: Just turn A into Entry presignal, and turn A and B signals to exit signals. Like [[:image:Terminal2.png|in this picture]]. How it works? If Exit Presignals B, C are both red, then Entry Presignal A is  red too. Then a third train cant pass trough Signal A.
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Stations without any presignals have a big problem: just have a look on the Image to the below. Signal A should be red...[[Image:Terminal1.png|270px|center|thumb|Problem at stations without Presignals]]
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If you let one more train to enter into the station, it will block the exit, because A signal is green. This problem is solvable with presignals: Just turn A into Entry presignal, and turn B and C signals to exit signals. [[Image:Terminal2.png|276px|center|thumb|Station with Presignals]] How does it work? If Exit Presignals B, C are both red, then Entry Presignal A is  red too. Then a third train cannot pass trough Signal A.
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==Part 3: An Effective RoRo station==
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Combo Presignals are mostly placed between Entry, and Exit presignals, because the Combo Presignals transmits the Exit presignal signs for the Entry Presignals. Combo presignals behave as an entry presignal and an exit presignal both.[[Image:RORO1.png|center|thumb|526px|RORO station]] In the Image above, signal A is Entry Presignal, signals B, C, D, E are Combo ones, and F-K are Exit Presignals.
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If F and G Platforms are used, then Combo signal B uses its Entry Presignal alibity, and it will turn to red, because F, and G Exit Presignals are both red. But the Entry Presignal A is remains green. Exit presignals H-K are green, then Combo Presignals D, E is green, then Signal C is green too. With this Combo Presignal B is red and C is green, then the Entry Presignal A is remains green.[[Image:RORO2.png|center|thumb|526px|The Entry remains green]]
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The Entry Presignal A will be red only, if all Platforms are used, Exit Presignals F-K are red. If F-K are red, then all Combo Presignals B-E are red too, then the Entry A will be red.[[Image:RORO3.png|center|thumb|520px|All Platforms red]]
  
==Part 3: How to use the Combo Presignal==
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[[Guides:Presignals|^^ Back to Presignals Guides Index]] | [[Oneway_or_Twoway_Presignals|Oneway or Twoway Presignals >>]]
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[[Category:Guides]]
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[[Category:Basic networking]]

Latest revision as of 09:49, 17 December 2013

^^ Back to Presignals Guides Index | Oneway or Twoway Presignals >>

Presignal Basics

The Presignal Basics is explained here: how they work, how they behave, and how does work a terminal station, and whats the use of the combo presignal.

Part 1: Identify the signals

There are six types of signals in OTTD. If you click on a normal signal with CTRL is held, these signals will appear:

Normal Signal: It does not have any special alibity, it turns to red if the next signal block is blocked by any train.

Entry Presignal: It works like a normal signal, plus it turns to red if all exit presignals, or combo presignals are red after it.

Exit Presignal: It works same as normal signal, but it signs for the entry, or combo signals, if self is red.

Combo Presignal: It has both Entry and Exit presignal alibities: It turns to red if all Exit/Combo are red after it, and it signs for the Entry/Combo Presignals, if the self is red.

PBS Signal : Not a Presignal, it enables more trains in one signal block, since PBS means Path Based Signaling. This type of signal is not explained here.

One-Way PBS Signal : It works like a PBS Signal, however, it prohibits passing through from the back side. This type of signal is not explained here.

Different signal types

Part 2: The Station Problem

Stations without any presignals have a big problem: just have a look on the Image to the below. Signal A should be red...
Problem at stations without Presignals
If you let one more train to enter into the station, it will block the exit, because A signal is green. This problem is solvable with presignals: Just turn A into Entry presignal, and turn B and C signals to exit signals.
Station with Presignals
How does it work? If Exit Presignals B, C are both red, then Entry Presignal A is red too. Then a third train cannot pass trough Signal A.

Part 3: An Effective RoRo station

Combo Presignals are mostly placed between Entry, and Exit presignals, because the Combo Presignals transmits the Exit presignal signs for the Entry Presignals. Combo presignals behave as an entry presignal and an exit presignal both.
RORO station
In the Image above, signal A is Entry Presignal, signals B, C, D, E are Combo ones, and F-K are Exit Presignals. If F and G Platforms are used, then Combo signal B uses its Entry Presignal alibity, and it will turn to red, because F, and G Exit Presignals are both red. But the Entry Presignal A is remains green. Exit presignals H-K are green, then Combo Presignals D, E is green, then Signal C is green too. With this Combo Presignal B is red and C is green, then the Entry Presignal A is remains green.
The Entry remains green
The Entry Presignal A will be red only, if all Platforms are used, Exit Presignals F-K are red. If F-K are red, then all Combo Presignals B-E are red too, then the Entry A will be red.
All Platforms red

^^ Back to Presignals Guides Index | Oneway or Twoway Presignals >>

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  • This page was last modified on 17 December 2013, at 09:49.