Sorry haven't got back on this one- life hectic at present.
Basically a pretty reasonable answer
However I think the occurrance of the poor sighting is far more likely to be due to LONGER trains that barely fit in the platform and so have poor visibility from the driver's cab- particularly if the "cab sight lines" are more restricted than previous rolling stock. Tends to be the case nowadays when the cab is designed for better driver comfort in normal operation and indeed safety in the event of a collision- tends to be further back from the windscreen and the front of the train.
I did wonder about the hazards- to me the SPAD is the hazard and which particular accident which might result from it is a matter to reflect on an Event Tree but the hazard would be the same in each case. Not really sure what the examiners wanted here though- being a terminal station it is not one where there will be very many different types of SPAD causes. Perhaps you could have a SPAD because
a) failed to check for signal at all having been given the right away
b) looked across to the parallel signal as own not well visible
c) too close to own signal and therefore read through to the next one ahead.
Feel it needed more than that though......
I thought your answer to part b) was good and apparopriate to the mark allocation.
e) started ok but you didn't really apply it to the two solutions suggested in d) as you had ben asked to do- a bit too much repeat from Yellow Book without actually applying.
Overall though a pretty solid answer that ought to be a decent pass I think.
Basically a pretty reasonable answer
However I think the occurrance of the poor sighting is far more likely to be due to LONGER trains that barely fit in the platform and so have poor visibility from the driver's cab- particularly if the "cab sight lines" are more restricted than previous rolling stock. Tends to be the case nowadays when the cab is designed for better driver comfort in normal operation and indeed safety in the event of a collision- tends to be further back from the windscreen and the front of the train.
I did wonder about the hazards- to me the SPAD is the hazard and which particular accident which might result from it is a matter to reflect on an Event Tree but the hazard would be the same in each case. Not really sure what the examiners wanted here though- being a terminal station it is not one where there will be very many different types of SPAD causes. Perhaps you could have a SPAD because
a) failed to check for signal at all having been given the right away
b) looked across to the parallel signal as own not well visible
c) too close to own signal and therefore read through to the next one ahead.
Feel it needed more than that though......
I thought your answer to part b) was good and apparopriate to the mark allocation.
e) started ok but you didn't really apply it to the two solutions suggested in d) as you had ben asked to do- a bit too much repeat from Yellow Book without actually applying.
Overall though a pretty solid answer that ought to be a decent pass I think.
(22-09-2013, 10:36 PM)Hort Wrote: Hi, thanks for previous comments, I have attempted Q7 of the 2012 paper.
PJW