I think there is only 2 PF..the third PF which you might have misunderstood is the Freight Unloading Point.& another speciality about the PFs in GOGH is that both the PF's are situated in the Up Line...i.e. if a Dn train wants to halt either @ PF#1/2,then it has to switch over the tracks & during the course of time no Up train can go through GOGH.The proposed New Alipurduar Station in SMTA-NCB double line section is also going to be this type of Block station.