Difference between revisions of "Oneway or Twoway Presignals"
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[[Image:Twoentry.PNG|thumb|center|327px|A RoRo station with two Entries]] | [[Image:Twoentry.PNG|thumb|center|327px|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! | ||
| − | [[Image: | + | [[Image:Twoentry2.PNG|thumb|center|327px|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: | 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: | ||
| − | [[Image: | + | [[Image:Twoentry3.PNG|thumb|center|327px|Now an Oneway Combo Presignal added after it]] |
With this Entry Presignal A cant look for Platforms F-H. | With this Entry Presignal A cant look for Platforms F-H. | ||
Revision as of 11:18, 29 December 2005
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 combopresignal can make errors in your network.
Part 1: The Station etrance 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 onaway or add an oneway Combo Presignal after it, like in the next picture:
With this Entry Presignal A cant look for Platforms F-H.
