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Chicago Loop - P4 Locked with movement over P3 when reversed

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Chicago Loop - P4 Locked with movement over P3 when reversed 16/04/2017 at 18:32 #94520
rfw
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I've just found a slightly unexpected feature as a result of locking involving T102, P3 & P4

See chain of events below...


Train A has previously been sent from signal X110 to X3 leaving points P1, P12, P4 & P11 in a reverse position


Train B is routed from signal X110 to X108, locking points P3 & P7 in a reverse position


Train B enters track section T102 & P4 becomes locked in the position they were last in (reversed)


Train C needs to be routed from signal 2 to X112. When I try to do this I get the following message, telling me the "point(s) are locked reverse by another route" referring to points P4


If I route train C over the square before train B enters T102, P4 is normalised & routing of train C from signal 2 to X112 is successful, thus locking points P1, P4 & P5 normal



Is i just a quirk of the locking or is there a way to change it, such P4 is not locked or locked normal when T102 is occupied and P3 is reversed? I get if it's like that in real life, then nothing can be done, but if not that would save some frustration!

-RFW

Last edited: 16/04/2017 at 18:32 by rfw
Reason: None given

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The following user said thank you: DaveBarraza
Chicago Loop - P4 Locked with movement over P3 when reversed 16/04/2017 at 19:01 #94523
Steamer
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All points in an occupied track circuit, regardless of whether they're in a route, are locked when the track circuit is occupied. It's a safety feature of the interlocking.
"Don't stress/ relax/ let life roll off your backs./ Except for death and paying taxes/ everything in life.../ is only for now." (Avenue Q)
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The following user said thank you: rfw
Chicago Loop - P4 Locked with movement over P3 when reversed 16/04/2017 at 20:21 #94526
GeoffM
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Thanks - the second points (non-route) should indeed be called normal by the first (route) points for this very reason. Will add it to our bug board.
SimSig Boss
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The following users said thank you: rfw, DaveBarraza
Chicago Loop - P4 Locked with movement over P3 when reversed 22/06/2021 at 14:26 #140127
DaveBarraza
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Steamer in post 94523 said:
All points in an occupied track circuit, regardless of whether they're in a route, are locked when the track circuit is occupied. It's a safety feature of the interlocking.
The above is true, but if locking points that could have been pre-positioned would result in a loss of flexibility (e.g. unnecessarily preventing parallel routes) then one should throw them even through the train might not actually be traversing them.

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Chicago Loop - P4 Locked with movement over P3 when reversed 22/06/2021 at 14:37 #140129
DaveBarraza
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rfw in post 94520 said:
I've just found a slightly unexpected feature as a result of locking involving T102, P3 & P4
Where does one find the Point numbers? "P4" etc? not on the signal number plan.

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Chicago Loop - P4 Locked with movement over P3 when reversed 22/06/2021 at 15:08 #140130
Dionysusnu
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DaveBarraza in post 140129 said:
rfw in post 94520 said:
I've just found a slightly unexpected feature as a result of locking involving T102, P3 & P4
Where does one find the Point numbers? "P4" etc? not on the signal number plan.

Press F11, go to points tab, click the mouse-like icon, then click the point in the view. That will select the point in the list, revealing its name and allowing you to customise its settings.

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The following user said thank you: DaveBarraza
Chicago Loop - P4 Locked with movement over P3 when reversed 22/06/2021 at 15:42 #140134
DaveBarraza
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Wow thanks I had no idea about that menu, and I'd been wanting to send a maintainer out to crank points for a while. I guess I need to subscribe to the maintenance-grams!

thanks again!

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