I won't be able to respond to the first part for a couple of days as I have other calls on my time, but the second part is quicker for me.
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The concept is that we need for release of overlap locking to be convinced the train has been on the berth track of the signal for such a long time that it must actually have stopped. For approach release it depends on the type of signal, but broadly we wish to ensure that the train is sufficiently close to the signal (hence not yet stopped but moving relatively slowly) that can see the aspect and in particular the route indicator clearly. For a Warning class route it is similar but more to do with having controlled down to a relatively low speed that adequately mitigates the risk of the short overlap beyond the following signal.
Re the calculation of specific times I suggest you look at the attachment on a post relating to time values. Then if there are any remaining doubts having studied this, ask more specifically.
.
The concept is that we need for release of overlap locking to be convinced the train has been on the berth track of the signal for such a long time that it must actually have stopped. For approach release it depends on the type of signal, but broadly we wish to ensure that the train is sufficiently close to the signal (hence not yet stopped but moving relatively slowly) that can see the aspect and in particular the route indicator clearly. For a Warning class route it is similar but more to do with having controlled down to a relatively low speed that adequately mitigates the risk of the short overlap beyond the following signal.
Re the calculation of specific times I suggest you look at the attachment on a post relating to time values. Then if there are any remaining doubts having studied this, ask more specifically.
(07-09-2011, 07:51 PM)kirandas Wrote: Hi
I have tried to attempet the 2010 signal Control Table.Can any one please check and let me know my drawbacks.
Iam finding difficulty to clacualte the approach release time dealys and sectional route locking release time delay. Kindly explain the concept.
Regards
Kirandas
PJW