AdMet CTC Working

 
  62430 Assistant Commissioner

Location: Metro Adelaide
Mention of CTC in another thread has prompted me to ask the following questions. Before the recent Goodwood Jn work, there were signs indicating CTC working on the Belair line S of Goodwood. I assume this dated from the SG work in 1995. What distinguished CTC from the other forms of working on the AdMet system? Does this distinction still survive or have the methods of working been rationalised across the network?

Alex C

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  Jumbo2001 Junior Train Controller

Mention of CTC in another thread has prompted me to ask the following questions. Before the recent Goodwood Jn work, there were signs indicating CTC working on the Belair line S of Goodwood. I assume this dated from the SG work in 1995. What distinguished CTC from the other forms of working on the AdMet system? Does this distinction still survive or have the methods of working been rationalised across the network?

Alex C
62430


From memory, I'm sure I'll be corrected if I am wrong, but there were certain rules in the old (AN/SAR based rule book) that were specific to CTC territory. When we changed to the new rule book (adaptation of the National Rules) most if not all the rules that were applicable to CTC apply everywhere else.

As for the line itself, it is still considered CTC single line working with passing loops. As opposed to single line automatic block signalling (Gawler-Gawler Central, Grange, Tonsley and Midlunga-Outer Harbor). Having been trained on the old rules initially, then 'updated' to the new ones, I am not entirely sure how they train new recruits in regards to this.

I suppose in short, CTC is different to the other types of safe working as it is single line with passing loops. And that is pretty well it. The other types are single line automatic block signalling, double line automatic block signalling and train order working.
  62430 Assistant Commissioner

Location: Metro Adelaide
From memory, I'm sure I'll be corrected if I am wrong, but there were certain rules in the old (AN/SAR based rule book) that were specific to CTC territory. When we changed to the new rule book (adaptation of the National Rules) most if not all the rules that were applicable to CTC apply everywhere else.

As for the line itself, it is still considered CTC single line working with passing loops. As opposed to single line automatic block signalling (Gawler-Gawler Central, Grange, Tonsley and Midlunga-Outer Harbor). Having been trained on the old rules initially, then 'updated' to the new ones, I am not entirely sure how they train new recruits in regards to this.

I suppose in short, CTC is different to the other types of safe working as it is single line with passing loops. And that is pretty well it. The other types are single line automatic block signalling, double line automatic block signalling and train order working.
Jumbo2001

Thanks for that info.

A further question, not totally unrelated: several months ago explicit yard limits signs appeared on the Seaford line.  Were yard limits in existence previously?  I assume that the yard linits are the boundaries of the automatic block signalling and controlled areas?

Alex C
  steam4ian Chief Commissioner

Alex.

We are NOT allowed to discuss the Seaford Line, it has been BLOCKED.

Ian
  justapassenger Minister for Railways

We are NOT allowed to discuss the Seaford Line, it has been BLOCKED.
"steam4ian"
That's next weekend. The line is open this weekend for regular and AOX trains, albeit with the last couple of trains each night substituted Wink
  justapassenger Minister for Railways

Thanks for that info.

A further question, not totally unrelated: several months ago explicit yard limits signs appeared on the Seaford line.  Were yard limits in existence previously?  I assume that the yard linits are the boundaries of the automatic block signalling and controlled areas?
"62430"
I believe this has been explained before as having something to do with the new national safety regulator, and that it applies to other lines too, not just the one Ian would have us calling the $3@ƒ0®d line.
  Jumbo2001 Junior Train Controller

Thanks for that info.

A further question, not totally unrelated: several months ago explicit yard limits signs appeared on the Seaford line. Were yard limits in existence previously? I assume that the yard linits are the boundaries of the automatic block signalling and controlled areas?

Alex C
62430


No probs Alex,

Further to your question regarding the Seafood (thanks autocorrect!) line, you may have noticed Yard Limit boards have appeared everywhere on the network within the last 12-18months. These came about because of the new rule book, and particularly because if a section is 'in a yard', then the authority required to proceed when signals fail/etc... is different and easier for the controllers to issue.

There were a few yard limit boards about with the old rule book (Goodwood comes to mind), but effectively, anywhere where there is are a set of switches and absolute signals you will find Yard Limit boards now.

So no, the yard limit boards are not there to delineate type of signalling.
  Gayspie Deputy Commissioner

Location: Adelaide, SA
Hi,
what is the difference between the Belair line CTC working and automatic block signal working on the single track lines?
  62430 Assistant Commissioner

Location: Metro Adelaide
No probs Alex,

Further to your question regarding the Seafood (thanks autocorrect!) line, you may have noticed Yard Limit boards have appeared everywhere on the network within the last 12-18months. These came about because of the new rule book, and particularly because if a section is 'in a yard', then the authority required to proceed when signals fail/etc... is different and easier for the controllers to issue.

There were a few yard limit boards about with the old rule book (Goodwood comes to mind), but effectively, anywhere where there is are a set of switches and absolute signals you will find Yard Limit boards now.

So no, the yard limit boards are not there to delineate type of signalling.
Jumbo2001

Thanks for your informative reply, Jumbo 2001.  After posting, I did recall the Goodwood boards near the Keswick Creek crossing.

Heath, the Belair line differs in that it is the only single line section with passing places.

Alex C
  Jumbo2001 Junior Train Controller

Hi,
what is the difference between the Belair line CTC working and automatic block signal working on the single track lines?
Heath Loxton


Can you be slightly more specific in the difference you mean? In general, as has been said, it is that CTC working is bidirectional with passing loops.

In a simple example, take the Grange line beyond the signal prior to Port Rd. This is signalled, however once a train is on the single line, the entire line is occupied and no other movements can occur. It is bi-directional, but only one train can be on the line at a time. On the Belair line, there are many more blocks (particularly between passing loops), so you have opposing movements to the loop, they pass, then carry on their way.

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