Difference between revisions of "Oneway or Twoway Presignals"

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(Part 1: The Station etrance problem with two entries)
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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.
 
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 etrance problem with two entries==
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==Part 1: The Station entrance problem with two entries==
 
[[Image:Twoentry.PNG|thumb|center|370px|A RoRo station with two Entries]]
 
[[Image:Twoentry.PNG|thumb|center|370px|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!
 
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!

Revision as of 21:06, 11 January 2006

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 onaway 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.

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