Difference between revisions of "Oneway or Twoway Presignals"
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Freshmeatt (Talk | contribs) m (Removed first picture to avoid confusion (I myself have spent like 5 minutes trying to find green C presignal.) |
Freshmeatt (Talk | contribs) (Undo revision 11763 by Freshmeatt (Talk)) |
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==Part 1: The Station entrance problem with two entries== | ==Part 1: The Station entrance problem 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 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! | + | [[Image:Twoentry.PNG|thumb|center|370px|A RoRo station with two Entries]] |
| − | [[Image:Twoentry2.PNG|thumb|center|375px| | + | 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! |
| + | [[Image:Twoentry2.PNG|thumb|center|375px|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: | 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: | ||
[[Image:Twoentry3.PNG|thumb|center|373px|Now an Oneway Combo Presignal are added after it]] | [[Image:Twoentry3.PNG|thumb|center|373px|Now an Oneway Combo Presignal are added after it]] | ||
Revision as of 19:10, 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 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!
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:
With this Entry Presignal A cant look for Platforms F-H.
<< Presignal Basics | ^^ Back to Presignals Guides Index | Priority >>
