30-05-2012, 11:43 AM
Rich,
I have had a quick read of the paper. At first glance, it seems to answer the questions but I would suggest at a level that is not deep enough to pass the exam.
There seems to be a contradiction on how DTG-R has been implemented in the real world and the limitations listed in the paper. Namely, two systems can, and do, run in parallel but it must be proven they do not contradict each other's movement authorities not decrease the level of safety.
The scenario in the paper is a gradual migration. Therefore, suggesting re-locking and re-controlling the infrastructure then fit the trains goes against what the question has asked - and would result in a closed railway for a not insignificant period. It is more probable that the trains would be dual fitted (tripcock on LU) and driven on lineside until all the trains (or sufficient to support the service) are fitted and then the TBCS would be switched on and lineside switched off in a traditional commissioning.
I would suggest that the examiners are looking for environmental testing, product approval, testing strategies etc. Some of these are discussed in the hazard section of the paper (EMC Interference doesn't make sense - but the term EMI would).
There is the bones of a good answer in the paper but I feel it would not pass simply because it doesn't answer the question.
Feel free to ask for further clarification and it would be good to see a resbumission of this paper following everyone's comments.
I have had a quick read of the paper. At first glance, it seems to answer the questions but I would suggest at a level that is not deep enough to pass the exam.
There seems to be a contradiction on how DTG-R has been implemented in the real world and the limitations listed in the paper. Namely, two systems can, and do, run in parallel but it must be proven they do not contradict each other's movement authorities not decrease the level of safety.
The scenario in the paper is a gradual migration. Therefore, suggesting re-locking and re-controlling the infrastructure then fit the trains goes against what the question has asked - and would result in a closed railway for a not insignificant period. It is more probable that the trains would be dual fitted (tripcock on LU) and driven on lineside until all the trains (or sufficient to support the service) are fitted and then the TBCS would be switched on and lineside switched off in a traditional commissioning.
I would suggest that the examiners are looking for environmental testing, product approval, testing strategies etc. Some of these are discussed in the hazard section of the paper (EMC Interference doesn't make sense - but the term EMI would).
There is the bones of a good answer in the paper but I feel it would not pass simply because it doesn't answer the question.
Feel free to ask for further clarification and it would be good to see a resbumission of this paper following everyone's comments.
Le coureur