Difference between revisions of "Oneway or Twoway Presignals"
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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 | + | 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== | ==Part 1: The Station entrance problem with two entries== | ||
| − | [[Image:Twoentry.PNG|thumb|center| | + | [[Image:Twoentry.PNG|thumb|center|404px|A RoRo station with two Entries]] |
| − | In this station the combo presignal can make errors, but can you notice why? If F-H | + | 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! |
| − | [[Image:Twoentry2.PNG|thumb|center| | + | [[Image:Twoentry2.PNG|thumb|center|404px|The Error: Signal A remains green]] |
| − | How to fix this? Just change the | + | How to fix this? Just change the combo presignal C to oneway (shown in first picture) or add an oneway combo presignal just after it, like in the next picture: |
| − | [[Image:Twoentry3.PNG|thumb|center| | + | [[Image:Twoentry3.PNG|thumb|center|404px|Now an oneway combo presignal is added after it]] |
| − | With this | + | With this layout, entry presignal A can't look for platforms F-H. |
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[[Presignal_Basics|<< Presignal Basics]] | [[Guides:Presignals|^^ Back to Presignals Guides Index]] | [[Priority|Priority >>]] | [[Presignal_Basics|<< Presignal Basics]] | [[Guides:Presignals|^^ Back to Presignals Guides Index]] | [[Priority|Priority >>]] | ||
[[Category:Guides]] | [[Category:Guides]] | ||
Revision as of 20:07, 22 August 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
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!
How to fix this? Just change the combo presignal C to oneway (shown in first picture) or add an oneway combo presignal just after it, like in the next picture:
With this layout, entry presignal A can't look for platforms F-H.
<< Presignal Basics | ^^ Back to Presignals Guides Index | Priority >>
