(30-06-2010, 07:10 AM)greensky52 Wrote: In Study Pack AppendixW Activity1C: at last part of stopping headway calculation for Up Main, it says "To achieve the stopping headway, this signal would also have to be the first cautionary aspect, and hence 3 aspect signalling is appropriate (at least in the station area)". But I did not find any hint about why choosing 3 aspect signal.
The Study Pack says: [i]
Assuming a platform dwell time of 30s (pessimistic since other platforms are available), and a sighting time of 12s, this leaves 150
PJW