Difference between revisions of "Oneway or Twoway Presignals"

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(Part 1: The Station entrance problem with two entries)
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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.
 
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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With this Entry Presignal A cant look for Platforms F-H.
 
With this Entry Presignal A cant look for Platforms F-H.
  
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[[Guides|<< Back to Index ]] | [[Priorities| Part 3: Priorities >>]]
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[[Presignal_Basics|<< Presignal Basics]] | [[Guides:Presignals|^^ Back to Presignals Guides Index]] | [[Priority|Priority >>]]
 
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Revision as of 16:17, 19 July 2010

<< 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

A RoRo station with two Entries

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!

The Error: Signal A remains green

How to fix this? Just change the Combo Presignal C to oneway or add an oneway Combo Presignal after it, like in the next picture:

Now an Oneway Combo Presignal are added after it

With this Entry Presignal A cant look for Platforms F-H.


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

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