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Timetable Query...

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Timetable Query... 04/06/2019 at 21:15 #118735
VInce
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Hi all,

Just playing around - for my own entertainment, nothing else - with the 2019 supplied timetable for Sheffield ROC.

I've come across this, something I've not seen before and I've dissected and created a lot of timetables.

In the attached picture there appears two "next trains" off 2P92. Now since 2P92 is formed 1x153 then it is not a detachment, but just what is it?

An error perhaps or something new - anyone help?

Vince

PS - Analysis doesn't throw up any errors...


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Last edited: 04/06/2019 at 21:18 by VInce
Reason: None given

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Timetable Query... 04/06/2019 at 21:20 #118736
MarkC
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If you look at the timetable itself you will notice a N? the question mark after the N indictes It has a decision attached to the the next working, one of the 2 indicated next workings will run, but the sim will not know which one until the train arrives at the station
It's not my fault! I was left unsupervised.
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Timetable Query... 04/06/2019 at 21:23 #118737
VInce
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MarkC in post 118736 said:
If you look at the timetable itself you will notice a N? the question mark after the N indictes It has a decision attached to the the next working, one of the 2 indicated next workings will run, but the sim will not know which one until the train arrives at the station
Mark,

Thank you - I've learned something today...

Regards,

Vince

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Timetable Query... 04/06/2019 at 22:42 #118740
postal
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Vince

Just to help things along, the TT analyser was written before we had decisions. That means it gets indigestion in a situation like the 2P92 you describe. The analyser will probably throw a warning about an incorrect length for one of the two choices for the following working and then warnings at every step beyond that if the next working is part of a chain. It also loses track of the trains it has orphaned and produces lots of "TD already used" and "TD never runs" warnings. The 1979 Carlisle TT generates about 135 such warnings and they are nearly all the result of N actions being governed by a decision although the TT runs fine in practice.

"Always forgive your enemies -- nothing annoys them so much" - Oscar Wilde (16/10/1854 – 30/11/1900), Irish poet and playwright.
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The following user said thank you: VInce
Timetable Query... 06/06/2019 at 22:06 #118796
Jan
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And conversely, the analyser currently doesn't catch a train with two next workings and no decisions involved (so a genuine error), either.
Two million people attempt to use Birmingham's magnificent rail network every year, with just over a million of them managing to get further than Smethwick.
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Timetable Query... 07/06/2019 at 00:04 #118799
GeoffM
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Jan in post 118796 said:
And conversely, the analyser currently doesn't catch a train with two next workings and no decisions involved (so a genuine error), either.
I just tried that and yes it does report it.

SimSig Boss
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The following user said thank you: VInce
Timetable Query... 07/06/2019 at 22:43 #118826
Jan
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Are you sure? This snapshot has the old version of the WARM 2016 timetable, where 2B15/$L26418 still has three next train activities, and for me with loader 4.12, the analyser doesn't show anything regarding that train (see Mantis #23556).
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Two million people attempt to use Birmingham's magnificent rail network every year, with just over a million of them managing to get further than Smethwick.
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Timetable Query... 08/06/2019 at 06:14 #118834
GeoffM
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Jan in post 118826 said:
Are you sure?
I previously said...

GeoffM in post 118799 said:
I just tried that and yes it does report it.
Maybe there is something unusual about the West Anglia one but it definitely reported it.

SimSig Boss
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