Three new Union Pacific GE ET44AC (ET44AH) locomotives growl up the steep grade of Tehachapi Pass at Bealville, California, on March 1, 2016, with an eastbound manifest freight. The large train dominated by heavy lumber loads is stretched out in the Allard horseshoe curve around the corner as mid-train “swing” helpers (DPUs) about two-thirds of the way back in the train appear on the other side of the horseshoe, working hard in tandem with the head end.
