Union Pacific EMD SD40-2 No. 3299, GE AC4400CW No. 6781, EMD SD70M No. 5146 and EMD SD9043MAC No. 3681 sit outside Union Pacific’s Downing B. Jenks Shop near the north transfer table at North Little Rock, Arkansas, on May 19, 2015. UP No. 3299 is undergoing a SD40N transformation in railroad’s extensive rebuild program of old SD40-2s and is well on its way to becoming a “new” SD40N.