2005 Module 2 Layout Calculations

[kiran218]

Hi PJW,

In the recent papers like 2010 and 2011 solved papers contingency is not taking. In the comming exam 2013 we have to fallow contingency or not.

with regards,
kirankumar

It really doesn't matter. The 10% figure is "plucked out of the air" and so, whereas I agree there is a small amount of ambiguity, any discussion whether the calculation is based on 136s or 135s is irrelevant- personally I'd do the division and therefore utilise 136s, but IT DOESN'T MATTER.
You have the concept- now move on.

Dear PJW,

If contingency is provided for headway is 10% and headway time is 150sec. Practical headway time we have to take 150/1.1=136 or 150-10%=135 which is we have to fallow in the exams. what is the difference between two.

with regards,
kirankumar

The whole point is that it is a judgement call, depending on all the circumstances; for IRSE exam I would not be overly concerned whether put a 10 second contingency or any reasonable percentage say from 2 - 20 per cent. Understand WHY we put a margin and the factors that determine what might be appropriate; don't worry re the ABSOLUTE VALUE in any particular circumstance!

Hi NJK,

1o percent of contigency is required for headway time. Under what conditions we have to fallow this?

With Regards,
KiranKumar

Dear Members,

I have attempted module 2 2005 layout calculation. Kindly review it and give your comments for my further enhancement.

Thanks in advance.

Regards,
NJK