Regulators Restart Clock on $85 Billion Union Pacific–Norfolk Southern Merger

The most consequential railroad deal in a generation cleared a critical procedural hurdle this week, as federal regulators revived their review of Union Pacific's $85 billion takeover of Norfolk Southern, a combination that would create the first true coast-to-coast single-line railroad in United States history.

The Surface Transportation Board announced it had lifted the proceeding out of abeyance and set a firm timetable for weighing the merger, after the two carriers submitted additional documentation in July that the Board deemed sufficient to move forward. Regulators stressed the decision "does not constitute a ruling on the merits," but it restarts a clock that both companies have been anxiously watching.

Under the schedule, parties must file notices of intent to participate by September 4, with public comments due November 18 and response comments by February 16, 2027. A public hearing will be set later. The Board also ordered the applicants to resubmit unfiltered internal workpapers and rejected their bid to fast-track a St. Louis terminal divestment.

The stakes are enormous. The tie-up would carry a combined enterprise value north of $250 billion, promise some $2.75 billion in annual synergies, and hand Norfolk Southern shareholders one Union Pacific share plus $88.82 in cash apiece. Shareholders of both railroads approved the deal last November.

But the transcontinental ambition faces fierce headwinds. Rival BNSF, backed by Berkshire Hathaway, and a coalition of shippers have warned the merger could throttle competition and raise freight costs across the network. Consumer and agricultural groups are expected to flood the docket before the November deadline.

Union Pacific maintains the deal meets the STB's public-interest test and still expects to close in early 2027 — provided regulators, and a growing chorus of opponents, don't derail it first.