More than one flashy chestnut horse has been catching the attention of railbirds at Nad Al Sheba Racecourse this week. A. P. Arrow, a six-year-old son of A.P. Indy, has cut an impressive figure on the track under exercise rider Eddie King, drawing questions of "Who's that?" along with some oohs and ahhs, even when he has been out at the same time as that better known red streak called Curlin.