(25-06-2012, 05:06 AM)savitha kandasamy Wrote:(24-06-2012, 04:36 PM)Peter Wrote:(24-06-2012, 12:44 PM)savitha kandasamy Wrote: Hi,
I solved the Q8 of Appendix W. Please review it.
regards,
savitha
I assume that this is from the study pack, which I do not have access to at the moment. Can you please post the question as well!
Peter
hi,
It's from study pack. Kindly see the attachment for the question from study pack.
-savitha
Generally seem to have made a good attempt.
You correctly determined that it is the passenger train rather than the freight train which is the more onerous constraint regarding the minimum signal spacing for braking, but it would have been good to have stated this explictly.
Conversely you do not seem to have considered whether the capacity requirement needed for the freight trains at night gives rise to a more onerous constraint on the maximum spacing than that imposed by the passenger train required headway, or indeed the maximum amount of overbraking considered tolerable.
Also in the exam don't just quote the formula re Headway, but explain using a diagram its derivation.
PJW