STB restarts review of Union Pacific–Norfolk Southern merger, revives environmental review

The Surface Transportation Board on Tuesday formally restarted its review of Union Pacific’s proposed merger with Norfolk Southern, lifting the case out of abeyance, reviving the environmental review and setting the first major deadlines for public participation and formal opposition. The board stressed that the move is procedural, saying its action “does not constitute a ruling on the merits” of the application or related issues raised by commenters.

The decision opens the next phase of federal scrutiny for the roughly $85 billion stock-and-cash deal announced in July 2025. If approved, the merger would create what the companies describe as the first U.S. coast-to-coast freight railroad and would shrink the number of major Class I freight railroads in the United States from six to five. Because the Surface Transportation Board is the federal agency that decides major rail mergers under a public-interest standard, the case could influence competition, freight service, labor conditions and supply-chain flows across the national rail network.

In a press release, the board said it had “adopted a procedural schedule for the consideration of the revised major merger application filed by Union Pacific (UP) and Norfolk Southern (NS).” It added: “Today’s decision removes the merger proceeding, including the environmental review, from abeyance and initiates the process for evaluating the merits of the proposed merger transaction.”

The new timetable sets Sept. 4, 2026, as the deadline for notices of intent to participate. Comments on the revised application — including protests and requests for conditions — are due Nov. 18, 2026. Responses to those filings are due Feb. 16, 2027. Public hearing dates have not yet been set and will be announced in a later decision.

The board also directed Union Pacific and Norfolk Southern to refile within 10 days any workpapers that had been screened or filtered, and to do so without filtering so regulators can review the full datasets. Those unfiltered workpapers are due Aug. 28, 2026. In the same decision, the board denied the companies’ request for an expedited proceeding tied to their proposal to divest control of the Terminal Railroad Association of St. Louis, a secondary issue in the broader merger case.

Tuesday’s order marks the next major procedural step after the board’s May 28, 2026, decision accepting the companies’ revised application for consideration but pausing the merger case and environmental review while it sought additional information. Union Pacific and Norfolk Southern then submitted supplemental information on July 7 and July 27. The board now says the record is sufficient to resume the schedule.

The board underscored that restarting the review is not the same as endorsing the merger. Its Aug. 18 press release said the decision “does not constitute a ruling on the merits of the merger application or any issues raised by commenters or in motions filed since Applicants’ July 27 submission.”

That distinction matters because the proceeding now moves into the stage where supporters and opponents can build the formal record the board will use to judge the deal. Union Pacific and Norfolk Southern have argued in prior filings that combining their networks would improve single-line service and produce about $3.5 billion in annual shipper savings. Those claimed benefits, along with expected objections from other stakeholders, will now be tested through the public comment process as the environmental review moves forward again.