Yes Long Back They have changed the Service of days as you said it will be with CSTM for whole one day as GDG have only 3PF and SUR-GDG DEMU occupy PF-3 for 6 hours from 7.30 to 2am so it will be PF Constraints for GG,Hampi,haripriya,UBL-SC,UBL-LTT weekly(SAT),UBL-BSB weekly,DWR-SUR passenger,TPTY-UBL passsenger these all will Arrive and Depart GDG after 7.30pm