The outcome of the Surface Transportation Board's review of the Union Pacific–Norfolk Southern merger by 31 December 2027

Clarifications: Resolve the question based on the Surface Transportation Board's final action on the Union Pacific–Norfolk Southern merger application. 'STB approves merger' means the Board grants approval without material merger-specific conditions beyond routine implementation requirements. 'STB approves merger with conditions such as divestitures, trackage rights, or gateway commitments' means the Board approves the transaction but imposes substantive conditions on approval. 'STB rejects merger' means the Board denies the application. 'Application withdrawn or merger abandoned' means the applicants formally withdraw the application or publicly abandon the transaction before a final Board decision. 'No final STB decision by 31 December 2027' means none of the other outcomes has occurred by then; interim procedural steps, requests for information, or draft decisions do not count as final decisions.