(23-07-2010, 09:05 PM)PJW Wrote: [quote='PJW' pid='1808' dateline='1279830154']
I will come back to review your points,
Again this CT was pretty similar.
You have missed shunt signals 302A(S) and 304A(S); yes you should always refer to the route boxes where signals have them, but do not ignore signals without them- generally signals only having one route aren't given them.
For the points in the overlap, the bracket should denote the extent of the route locking which is not demanded clear when the exit berth track(s) have been occupied for long enough to time train to a stand; you however place the bracket to include all tracks back to the the entrance signal.
You have stated that 114C(M) calls 201N; I remember from your route CT that you were not permitting a swinging overlap so this is ok; otherwise it would have had to be:
[114C(M) w 204N]
You have also stated that 114D(M) calls 201N, but actually there is an overlap shown over both lies and indeed your Route and Aspect CTs did reflect this, so you must be consistent here.
Indeed in order to direct an overrun onto the correct direction running line, the preferable lie for 201 would be Reverse. so a "soft call" would be appropriate- i.e. if the points are free 114D(M) would set Reverse but not lock them, thus getting the advantage of having then Reverse whenever possible yet not constraining layout flexibility when it is really needed.
As far as the locking is concerned you have shown these routes both locking the points both ways.
114C(M) should lock 201 from N to R; if you were permitting a swinging overlap, then the entry would be:
[114C(M) unless 204R] ----CF, CE CK, CJ [CH, CG--or (CH or CH) occ for 30]
Note that the overlap is not via AH, BH so these are not listed; CD is a deadlocking track so is not needed here.
There would be a counter-condition to satisfy before the overlap can be swung- however that would appear on 204's CT.
If we now assume the overlap beyond 110 is over 204R, 201 is no longer a trailing point but a 2nd set of facing points and is not locked.
Similarly for 114D(M) 201 are facing points in the overlap and there is no associated locking.
PJW