After the lead unit (now 3rd unit) crapped out on the D794 crew, they were taxied to Fredericksburg to pick up the 6159 and 1549, giving this train an incredible set of locomotives! With two GP38-2s' (Re-built GP40-2's) on either end, and a GP40-2- GP15 pair in the middle, this quartet of 4-axle EMD's sounded absolutely amazing as they blew by me in notch 8!