For the most part, the SU-99 consists of solid SD60 lashups every week, however every now and then ECO units and leased GP38-2s a tacked on to be dropped in Sparta. On the Friday the 13th Edition of the SU-99, that was the case, however instead of trailing, the Sparta power was put on as the leader, in the form of CSX GP38-2 #2700. Seen here the tri-weekly SU-99 is seen crossing the Hackensack River after just beginning its journey westward.