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Absolute Block working query in new Aston sim

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Absolute Block working query in new Aston sim 16/03/2014 at 18:38 #57147
Pinza
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Am an very much enjoying the new Aston Sim as it both free and workable as a single player

Has taken me a little while to get used to the Absolute Block working between Alrewas and Lichfield.

Have got used the procedure of asking if line is clear, advising train 'in section' and then re-setting to 'normal' after train is clear.

However I am a bit unclear as to when section is clear.



In the above screengrab,1Q24 has the slot given from TV44 signal to Lichfield LL.

At what point can I give line clear back to Alrewas?

Does the OVR button have any function? Or do I just have to wait until train has advanced beyond TV44?

Thanks in anticipation for any help

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Absolute Block working query in new Aston sim 16/03/2014 at 18:58 #57149
BoxBoyKit
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The OVR button is to do with cancelling a line clear, should the train not proceed for any reason. It is explained in the Wiki for Worksop, so I suspect it is in the Wiki for Aston.

As for giving out of section, (re-setting to normal) this should be done after the train has passed clear of TV44 signal, as that is where the block section ends.

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Absolute Block working query in new Aston sim 16/03/2014 at 19:12 #57151
Pinza
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Quote:
The OVR button is to do with cancelling a line clear, should the train not proceed for any reason. It is explained in the Wiki for Worksop, so I suspect it is in the Wiki for Aston.
Thanks for that - it was not covered in the Aston Wiki!

Wasn't my immediate thought to look at Worksop Wiki for query on Aston sim :lol:

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Absolute Block working query in new Aston sim 17/03/2014 at 04:48 #57188
BarryM
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" said:
Quote:
The OVR button is to do with cancelling a line clear, should the train not proceed for any reason. It is explained in the Wiki for Worksop, so I suspect it is in the Wiki for Aston.
Thanks for that - it was not covered in the Aston Wiki!

Wasn't my immediate thought to look at Worksop Wiki for query on Aston sim :lol:
Uh! It is in the Wiki. A whole 3 paragraphs of Absolute Block.

Barry, Sydney, New South Wales, Australia
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Absolute Block working query in new Aston sim 17/03/2014 at 10:44 #57200
kbarber
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" said:
Am an very much enjoying the new Aston Sim as it both free and workable as a single player

Has taken me a little while to get used to the Absolute Block working between Alrewas and Lichfield.

Have got used the procedure of asking if line is clear, advising train 'in section' and then re-setting to 'normal' after train is clear.

However I am a bit unclear as to when section is clear.



In the above screengrab,1Q24 has the slot given from TV44 signal to Lichfield LL.

At what point can I give line clear back to Alrewas?

Does the OVR button have any function? Or do I just have to wait until train has advanced beyond TV44?

Thanks in anticipation for any help
The point at which you can give Train out of Section, in theory, would be somewhat beyond TV44. In general, Absolute Block requires 1/4 mile clear beyond the home signal (or at least, it used to in my day) before a train can be accepted from the box in rear (the Clearing Point) and the regulations require that the arriving train has passed beyond the clearing point before TOS is given.

I notice TV44 is shown with an overlap. Can Howard tell us whether this is a standard 183 metre distance? Or whether it is some other distance, greater or less, that corresponds with an actual track circuit on the ground? It may be that this is intended to be used as the clearing point (and for a train routed to the Low Level I'd choose an equivalent distance, or normalise the points as soon as the train has passed over them, to give the overlap before the train has gone the full distance).

However...
I'm not sure whether the line from Alrewas to TV High Level is classified (and signalled) as a passenger or goods line. In 1980 (the most recent Sectional Appendix I have) it was classified as a passenger line, but as far as I can see it carries no passenger traffic nowadays. Has it been reclassified? Again, Howard will be the one to enlighten us.

That matters because it affects the signalling. It used to be (but I suspect no longer is) that a line classified as a goods line was worked by Permissive Block unless otherwise shown. Where a goods line was shown to be worked by Absolute Block it was normal to make the home signal the clearing point. In which case you could indeed clear back as soon as the train passes TV44. Such niceties would be shown in the Signalbox Special Instructions but might be quite difficult to find elsewhere.

That probably doesn't sound like a lot of help; sorry. But perhaps Howard can clear up the details and if not it might help someone seek out the right details.

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Absolute Block working query in new Aston sim 17/03/2014 at 11:37 #57204
Andrew G
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Where there is a colour light distant signal the standard clearing point is 200 Yards. I think it remains as 440 yards for a Semaphore Distant. Saying that as KB has mentioned the Local/Special Instructions for a particular box might amend this - usually to the end of a Track Circuit or some clearly defined point.

While there is no booked passenger traffic I am confident the line is signalled to passenger standards. There are some forthcoming or have been some recent planned diversions and I have travelled over the line on an unplanned diversion on a Cross Country service. The Train Manager was able to give an accurate arrival time in New Street as we were stuck behind a local train all the way from Lichfield!

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Absolute Block working query in new Aston sim 17/03/2014 at 20:28 #57239
Pinza
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BarryM wrote:

Quote:
Uh! It is in the Wiki. A whole 3 paragraphs of Absolute Block.
Yes, I accept that BarryM, but no reference in those 3 paragraphs as to function of the OVR button in this particular sim.

I was mistakenly assuming that OVR stood for overlap and might indicate when I was clear of the home signal. It actually stands for overide as fully described in the Worksop manual:

Quote:
Cancelling/Overide

In certain circumstances (e.g. train wrongly routed/signal or points failure) it may be necessary to cancel a requested route. This can only be done by the receiving signal box (Box B).

To cancel a request (overide) RIGHT click on the 'OVR' button which will then start to flash white until the light steadies and “block overide release given” appears in the message panel. This may take several minutes. Box B may then RIGHT click on the white 'N' button which returns the section to normal/line blocked.

If Train on Line has already been sent, Box A section entrance signals must be cancelled/returned to normal before cancelling can be carried out by Box B.
I was just suggesting that this bit should be added to the Aston Wiki - or at least linked to.

Cheers

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Absolute Block working query in new Aston sim 17/03/2014 at 21:58 #57260
Hpotter
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Ah, poop! missed that from the sodding manual! :blush:

As for the line and how it's been signaled, it's done to passenger standards as it's used for regular diversions, the overlap marker on TV44 is the clearing point for the Absolute Block section from Alrewas S.B.

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Absolute Block working query in new Aston sim 17/03/2014 at 22:06 #57261
lazzer
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" said:
I think it remains as 440 yards for a Semaphore Distant.

Naturally, you mean semaphore "Home" there. :whistle:

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Absolute Block working query in new Aston sim 17/03/2014 at 22:30 #57265
Late Turn
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Nope, definitely the distant signal - that's what determines whether the clearing point is 440yds or 200yds in length.
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Absolute Block working query in new Aston sim 18/03/2014 at 20:20 #57328
Signalhunter
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" said:
Nope, definitely the distant signal - that's what determines whether the clearing point is 440yds or 200yds in length.
Correct!!

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