OMAHA, Neb. (AP) — Union Pacific has become the second major freight railroad in the past week to back away from the industry’s longstanding push to cut train crews down to one person as lawmakers and regulators increasingly focus on rail safety following last month’s fiery derailment in Ohio. The Omaha, Nebraska-based railroad said in a statement Saturday that it had reached an agreement with the union that represents conductors to drop its proposal to take those workers out of the cabs of locomotives just months after it was pressing to test out the idea of stationing conductors in trucks in parts of its 23-state network. Norfolk Southern made a similar announcement several days earlier.