Single line working systems

[steak]

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Working my way through the syllabus I came across this subject. Apologies if I have posted this in the wrong section, perhaps train protection?

Understand and explain:- Single line working systems

There is no mention of it in the study guides. I found 2012 past paper question 7 which has some relevance.

"Fully describe a signalling system which allows for the safe use of a single line section" 15 marks.

"When the system you have described for a single line operation suffers complete failure, describe a process to allow the continued safe operation of trains. What are the key hazards, risks and how might these be addressed"? 10 marks.

The problem for me was the first part of the question seems ambiguous.
Does it mean a double track with one line blocked  for maintenance, object on line etc so other line is used bi-directional with use of pilotman + ticket system?

Or does it mean an actual single line only railway?

I looked at the second part of the question, "single line operation suffers complete failure", I was thinking along the lines that would the pilotman suffer a "complete failure"?
Therefore I'm assuming that they are asking me to describe a signalling system that can be applied to a single line railway.....so I chose RETB.

Please review my answers and comment please.

I wasn't entirely sure about "key" hazards but had a stab at it.

Many thanks

[dorothy.pipet]

Have a look at the Mod 3 study guide, and for much better detail PJW's Mod2 guide from a few years ago which is in the mod2 further reading section.

As far as the question goes, in order to answer the second part you need to choose the first well. I agree that you must assume a single bi-di line rather than a temporary arrangement, and that you don't want to start with pilotman if that is your contingency measure. I would also choose something that is a through-line (like you have with RETB) rather than a dead-end branch (One train working for example). RETB is a good option, so is token machines.

I've not looked at your posts - I hope someone with better MOD5 knowledge will do that shortly.

[steak]

Have a look at the Mod 3 study guide, and for much better detail PJW's Mod2 guide from a few years ago which is in the mod2 further reading section.

As far as the question goes, in order to answer the second part you need to choose the first well. I agree that you must assume a single bi-di line rather than a temporary arrangement, and that you don't want to start with pilotman if that is your contingency measure. I would also choose something that is a through-line (like you have with RETB) rather than a dead-end branch (One train working for example). RETB is a good option, so is token machines.

I've not looked at your posts - I hope someone with better MOD5 knowledge will do that shortly.

Thank you. If I choose a through line it would provide more hazarads when the system goes down. Makes sense