MYS-MV exp was blocking platform at SBC for 45mins uselessly-previous arrival 18:15 & departure 19:00. To reduce that time, they have made MYS-MV exp to arrive at 18:45 with 19:00 departure. Previous arrival/departure of GG-18:50/19:00, so avoid that clash they made GG as the scapegoat with arrival/departure as 18:30/18:50 with slowing down by 30mins when it could have been actually speeded up.