Union Pacific and Norfolk Southern submit first round of answers to STB’s supplemental questions in merger review

Union Pacific and Norfolk Southern said they have filed the first portion of their responses to a Surface Transportation Board request for supplemental information tied to their proposed merger. In a joint statement dated July 7, 2026, the companies said they submitted the initial round of answers to the regulator, with further information to follow as the review proceeds.

The Surface Transportation Board, or STB, is the U.S. agency that oversees major rail consolidations and can require extra documentation before it moves forward with a fuller analysis. Both railroads characterized their filing as a step in the Board’s process, but they did not lay out new, deal-critical findings in the announcement.

The companies’ merger case has moved through the STB’s formal acceptance of a revised application phase. Railway Age reported that on May 28, 2026, the STB unanimously accepted the revised merger application for consideration, while also indicating that proceedings would be delayed pending additional information.

Separately, Progressive Railroading reported that an STB administrative law judge decision filed June 18 laid out the discovery and information-gathering structure for the case, including guidelines for how parties would exchange information during the review.

The companies have also argued, in earlier filings and commentary covered by freight-industry outlets, that the revised merger submission is comprehensive and complete. FreightWaves, for example, described a defense of the revised application’s completeness in a filing with the STB.

Union Pacific’s own April 30, 2026 press material described its amended merger application and included an estimate that shippers could realize $3.5 billion in annual savings, reflecting the companies’ view of potential network and operating efficiencies if the combination is approved.

In the July 7 update, Union Pacific and Norfolk Southern did not specify which categories of supplemental information the first response covers, nor did they provide any quantitative revisions or new commitments. They also did not announce a schedule for when the STB expects a second round of responses, what remaining questions are likely to be most consequential, or whether any further procedural steps, such as evidentiary hearings, will be triggered immediately.

For rail industry watchers, the filing underscores that the merger review remains in an evidence-gathering phase, not a final approval stage. The STB’s supplemental information requests often determine how broad the record will become and can shape the questions the Board asks about competition, service impacts, and implementation details.