1. For UK applications, a 10 sec sighting time is an established norm. It should be at line speed as this is the worst case for a train approaching the signal. You will see a typical of 200m in some examples, but this a simplistic generalisation.
2. Braking must be at linespeed, again the worst case.
3. If, as is normally the case in the exam, acceleration and braking rates are specified and are the same, both times will be the same and given by v/a from the basic laws of motion.
4. Contingency is a value judgement. Talking about it demonstrates that you know there is an issue. Dealing with it will tell the examimer how much you understand. It does not matter if you deduct an allowance off of the quoted time and calculate to achieve it, or work out the numbers for the ideal case and then scale that to give the allowance, you get to he same point.
5. I have not yet been able to view your attachment so cannot comment on that at this time.
Hope 1 to 4 is helpful but ask if not.
Peter
2. Braking must be at linespeed, again the worst case.
3. If, as is normally the case in the exam, acceleration and braking rates are specified and are the same, both times will be the same and given by v/a from the basic laws of motion.
4. Contingency is a value judgement. Talking about it demonstrates that you know there is an issue. Dealing with it will tell the examimer how much you understand. It does not matter if you deduct an allowance off of the quoted time and calculate to achieve it, or work out the numbers for the ideal case and then scale that to give the allowance, you get to he same point.
5. I have not yet been able to view your attachment so cannot comment on that at this time.
Hope 1 to 4 is helpful but ask if not.
Peter