Currently on the 6:55am Bradford Interchange to London King Cross GC service, which is a double unit due to the Challenge Cup Final taking place. Obviously due to Platform lengths at Halifax, Brighouse and Wakefield, only the front portion is stopping to set and pick. I'm in the rear portion and there must be at least 20+ passengers for the above stations all creating a fuss with the train staff, because they now have to go to Doncaster and await the returning GC from Kings Cross. Prior to leaving Bradford Interchange, no member of the train crew explained that only the front portion would stop at the intermediate stations between Bradford and Doncaster. Neither was there any announcements or information on the screens on Platform one at Bradford. Poor form from Grand Central.