Salida Division No. 122, January 4, 1931; Special Time-Table riles 6J: "At least one member of the train crew must be on the rear of the train on both ascending and descending grades, and a close observance of train be made for sliding wheels." That said, the only designated place for a Flagman was the rear car of the train in order to provide flag protection. So; with that in mind, caboose or not, the flagman is at his duly prescribed location, the rear car of the train. Convoluted, yes but rules correct. Paul.