2012 Q8

[Peter]

All,

I'm looking for some clarification / discussion on the above question and I guess the definition of risk / hazards.

The first part of the question is leading you towards MVDCs, axle counters and GPS positioning (ETCS).

The second part asks for three hazards, causes and effects for each for 9 marks. This puzzled me. Am I right in thinking that safety hazards would be something like signal reversion, section showing clear when occupied and section showing occupied when clear?

I would also say if this is right then a large number of the effects will be protecting signals at red / SPADs / delays.

Thanks in advance

Neil

The hazards that you have listed there would be fairly normal ones for TCs. I think that the question is looking for some hazards that are specific to the detection yep. For instance, axle counters have reset issues and do not provide any form of broken rail detection; a train based system may have issues with poor coverage, incorrect message identification, vulnerability to masquerade attacks. Think a bit wider than the traditional hazards of a TC not correctly performing its function.

Peter