13-01-2011, 12:45 AM
Hello PJW,
Many thanks for the detailed explanation - indeed i am aware that there are some aspects which i do not yet master and honestly i didn't spend too much time reading but practising as i know this is the best way. (and seems easier at the end of a full day to try some routes then try to read and understand a book).
One of the issues which i was interested in was understanding the case of route 124A(M) in relation to 107A(M) - you are right it shoudn't prevent the latter from setting but i put it there just because i did not know other way to provide flank protection for it when 303 was normal.
The other issue is timing the tracks - i understand it is for permissive routes (shunts) but also i know that when there are points in the O/L especially in platform areas one want to release them soon as possible from operational reasons - this is why i timed out 122A(M) and 112A(M) - however i can say i am not very sure when is to be applied and when not; for example, would it be necessary in case of call-on routes from these two signals?
I will take your advice and go reading for now but i might come back with one or two routes for your review in the mean time (if it's all right with you).
Thank you!
Many thanks for the detailed explanation - indeed i am aware that there are some aspects which i do not yet master and honestly i didn't spend too much time reading but practising as i know this is the best way. (and seems easier at the end of a full day to try some routes then try to read and understand a book).
One of the issues which i was interested in was understanding the case of route 124A(M) in relation to 107A(M) - you are right it shoudn't prevent the latter from setting but i put it there just because i did not know other way to provide flank protection for it when 303 was normal.
The other issue is timing the tracks - i understand it is for permissive routes (shunts) but also i know that when there are points in the O/L especially in platform areas one want to release them soon as possible from operational reasons - this is why i timed out 122A(M) and 112A(M) - however i can say i am not very sure when is to be applied and when not; for example, would it be necessary in case of call-on routes from these two signals?
I will take your advice and go reading for now but i might come back with one or two routes for your review in the mean time (if it's all right with you).
Thank you!