STB Accepts Revised Union Pacific–Norfolk Southern Merger Filing, Holds Review in Abeyance

The Surface Transportation Board, the federal agency that oversees rail mergers, said Thursday it has accepted for consideration Union Pacific’s revised application to acquire Norfolk Southern, but it is not yet moving the proposed deal into a full review on the merits.

In a unanimous May 28 decision, the board said it was “accepting for consideration the revised major merger application filed by Union Pacific (UP) and Norfolk Southern (NS).” At the same time, it put the proceeding in abeyance — including the environmental review — and ordered the railroads to submit more information by July 27.

That makes Thursday’s ruling an important procedural step for one of the biggest U.S. rail consolidation proposals in years, but not an approval. The board said the revised filing is complete enough to be considered under its rules for major rail mergers, while also making clear that key parts of the companies’ case remain unclear or underdeveloped.

Those rules, under 49 C.F.R. Part 1180, set a high bar for mergers involving major Class I freight railroads. Applicants must show that a transaction would enhance competition and produce public benefits that outweigh any harm.

The board’s order identified several areas where it wants stronger support before setting a fuller procedural schedule. It directed Union Pacific and Norfolk Southern to supplement the record on enhanced competition, access for so-called 2-to-1 and 3-to-2 shippers — customers with limited rail options — public-benefits diversion analysis, the service assurance plan, gateway and car-supply issues, market-share projections, downstream merger impacts, passenger rail and supporting workpapers.

In other words, the STB is signaling that it wants more detailed evidence on whether the combination would truly improve competition, preserve shipper access, protect service levels and avoid broader network disruptions.

The board also said it will prepare an Environmental Impact Statement under the National Environmental Policy Act, a more extensive environmental review process for major federal actions. But that review, like the rest of the case, is being held in abeyance while the applicants provide the additional material.

Once the environmental process begins in earnest, the board said it plans to hold at least 12 in-person public meetings and several virtual meetings. It also said it will create a public project webpage and seek preliminary comments from federal, state, Tribal and local agencies.

Thursday’s action follows an earlier setback for the companies. The STB rejected their original merger application, filed Dec. 19, 2025, as incomplete in a Jan. 16, 2026, decision and did so without prejudice, allowing them to try again. Union Pacific and Norfolk Southern submitted their revised application on April 30, and that is the filing the board has now accepted for consideration.

If approved, the transaction would combine two major Class I railroads into a single-line network spanning much of the country. In public materials released with the revised filing, the companies said the merger would remove about 2.1 million trucks from U.S. roads each year and save shippers about $3.5 billion annually. Those are company projections, not findings by the board.

Union Pacific CEO Jim Vena said in an April 30 company release, “This merger enhances competition and delivers real public benefits.”

The companies have also said they are targeting a closing in the first half of 2027, contingent on regulatory approval.

For now, the immediate next step is the board’s July 27 deadline. The STB said it “orders Applicants to submit supplemental information by July 27, 2026,” and that it will decide on the next procedural schedule only after reviewing that material.