Difference between revisions of "Oneway or Twoway Presignals"

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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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[[Presignal_Basics|<< Presignal Basics]] | [[Guides:Presignals|^^ Back to Presignals Guides Index]] | [[Priority|Priority >>]]
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=<center>Oneway or Twoway Presignals?</center>=
 
=<center>Oneway or Twoway Presignals?</center>=
Signals have two sides, in the basics part, the other side wasn`t important, since trains can`t turn back, etc. etc... But in more complex things, a badly placed twoway Combo Presignal can make errors in your network.
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Signals have two sides, in the basics part, the other side wasn't important, since trains can't turn back, etc. etc... But in more complex things, a badly placed twoway combo presignal can make errors in your network.
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==Part 1: The Station entrance problem with two entries==
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[[Image:Twoentry2.PNG|thumb|center|404px|The error]]
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In this station the combo presignal can make errors, but can you notice why? If presignals F-H are green then upper-right side of combo presignal C is green too. Even if presignals D and E are red, presignal A remains green. The problem is simple: Presignals calculate signal blocks, not the choosable tracks: trains cannot reach platforms F-H from A through C, but presignals CANNOT see this!
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[[Image:Twoentry.PNG|thumb|center|404px|Fix this error by making the combo a oneway signal]]
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How to fix this? Just change the combo presignal C to oneway (shown above) or add an oneway combo presignal just after it, like below:
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[[Image:Twoentry3.PNG|thumb|center|404px|Or add a oneway combo presignal is added after it]]
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With this layout, entry presignal A won't be affected by the signals for platforms F-H.
  
==Part 1: The Station etrance problem with two entries==
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[[Image:Twoentry.PNG|thumb|center|327px|A RoRo station with two Entries]]
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[[Presignal_Basics|<< Presignal Basics]] | [[Guides:Presignals|^^ Back to Presignals Guides Index]] | [[Priority|Priority >>]]
In this station the combo presignal can make errors, but can you notice why? If F-H presignals are green then Combo presignal C´s upper-right side is green too. Then if D and E exit Presignals, is red, then A Entry presignal remains green. The problem´s source is: Presignals calculates Signal Blocks, not the Possible chosable tracks: from A trough C and reach F-H platforms is impossible, but presignals CAN see this!
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[[Category:Guides]]
[[Image:Twoentry2.PNG|thumb|center|327px|The Error: Signal A remains green]]
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How to fix this? Just change the Combo Presignal C to onaway or add an oneway Combo Presignal after it, like in the next picture:
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[[Image:Twoentry3.PNG|thumb|center|327px|Now an Oneway Combo Presignal are added after it]]
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With this Entry Presignal A cant look for Platforms F-H.
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Latest revision as of 09:49, 17 December 2013

<< Presignal Basics | ^^ Back to Presignals Guides Index | Priority >>

Oneway or Twoway Presignals?

Signals have two sides, in the basics part, the other side wasn't important, since trains can't turn back, etc. etc... But in more complex things, a badly placed twoway combo presignal can make errors in your network.

Part 1: The Station entrance problem with two entries

The error

In this station the combo presignal can make errors, but can you notice why? If presignals F-H are green then upper-right side of combo presignal C is green too. Even if presignals D and E are red, presignal A remains green. The problem is simple: Presignals calculate signal blocks, not the choosable tracks: trains cannot reach platforms F-H from A through C, but presignals CANNOT see this!

Fix this error by making the combo a oneway signal

How to fix this? Just change the combo presignal C to oneway (shown above) or add an oneway combo presignal just after it, like below:

Or add a oneway combo presignal is added after it

With this layout, entry presignal A won't be affected by the signals for platforms F-H.


<< Presignal Basics | ^^ Back to Presignals Guides Index | Priority >>

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