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ARS and trains with TD of form 'nXnn'

You are here: Home > Forum > General > General questions, comments, and issues > ARS and trains with TD of form 'nXnn'

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ARS and trains with TD of form 'nXnn' 13/07/2017 at 16:35 #96361
Lyn-Greenwood
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239 posts
Why does ARS treat trains with a TD containing the letter 'X' in a special way?
While playing around with the 'Peterborough 2017 Austerity' timetable, I found that all trains with 'X' in the TD are reported by ARS as 'Entered off planned path & made non-ARS', even though they are on the planned path. The trains can't be made ARS for some reason, which means that they get ignored by the Peterborough 'Gate Box ARS' mode of Level-Crossing control, which is a bit of a pain.

Can anyone offer an explanation, please.

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ARS and trains with TD of form 'nXnn' 13/07/2017 at 16:45 #96362
JamesN
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1570 posts
Lyn-Greenwood in post 96361 said:
Why does ARS treat trains with a TD containing the letter 'X' in a special way?
While playing around with the 'Peterborough 2017 Austerity' timetable, I found that all trains with 'X' in the TD are reported by ARS as 'Entered off planned path & made non-ARS', even though they are on the planned path. The trains can't be made ARS for some reason, which means that they get ignored by the Peterborough 'Gate Box ARS' mode of Level-Crossing control, which is a bit of a pain.

Can anyone offer an explanation, please.
nXnn is "out of gauge or otherwise specially restricted" - ARS won't be aware of what those restrictions are so will not allow the train to run in ARS.

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ARS and trains with TD of form 'nXnn' 13/07/2017 at 17:01 #96363
Lyn-Greenwood
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239 posts
Thanks for the info, James. I thought there'd be a simple explanation. I'll just have to work the LC's manually.
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ARS and trains with TD of form 'nXnn' 13/07/2017 at 17:02 #96364
postal
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JamesN in post 96362 said:
nXnn is "out of gauge or otherwise specially restricted" - ARS won't be aware of what those restrictions are so will not allow the train to run in ARS.
That well know source of all that is factually correct has a page about headcodes here which gives a bit of flesh to the bones of the quote.

The page gives some information which is interesting with reference to Peterborough. The White Rose services from Kings Cross to Leeds were given 1Xnn train descriptions. This is from the period in the mid to late 1990's when GNER was hiring surplus Eurostar sets to give extra capacity between London and York/Leeds. Because of the length of the sets they could only be routed to certain platforms in Leeds so were given 1Xnn headcodes to remind the signallers at Leeds. Despite that there was at least one occasion (I have a hazy memory it was actually reported by the errant signaller on the old SimSig Forum) when the train was signalled into a wrong platfom completely locking up the West End of the station until arrangements could be made to shunt it to the correct platform.

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ARS and trains with TD of form 'nXnn' 23/07/2017 at 09:31 #96564
mfcooper
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postal in post 96364 said:

Because of the length of the sets they could only be routed to certain platforms in Leeds so were given 1Xnn headcodes to remind the signallers at Leeds.
And at Kings Cross they could only fit into platforms 1 or 6, so the 1Xnn was also useful for that signaller.

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The following users said thank you: postal, BarryM