U.S. Transportation Board Sends Union Pacific–Norfolk Southern Merger Back for Revision

The U.S. Surface Transportation Board (STB) has sent back Union Pacific’s proposed $85 billion merger with Norfolk Southern, ruling that the application lacks critical information required under federal railroad merger rules. The decision marks a significant early step in what is expected to be one of the most closely watched transportation merger reviews in decades.

In its ruling, the STB said the nearly 7,000-page application filed in December was incomplete because it failed to include detailed projections on market share and long-term competitive impacts. While the railroads provided historical market-share data from 2023, the board emphasized that applicants must show how competition would evolve several years after the merger is completed. Under rules adopted in 2001, railroad mergers must enhance competition, not simply maintain existing levels, while also delivering clear public-interest benefits.

The board rejected the filing without prejudice, meaning Union Pacific and Norfolk Southern are allowed to resubmit their proposal once the identified deficiencies are addressed. The STB also stressed that its decision should not be interpreted as an indication of how it might ultimately rule on the merits of a revised application.

The ruling follows concerns raised in a January filing by Canadian National, which argued that the merger application lacked essential competitive disclosures. These included the methodology used to identify routes where two rail lines would converge into one and comprehensive lists of shippers that could be affected by reduced competition. According to critics, these omissions limited the ability of stakeholders to fully assess the merger’s potential impact.

The proposed deal, which would create a coast-to-coast freight railroad, has received public backing from President Donald Trump. The current administration has generally favored approving large transactions, often with conditions or remedies, rather than blocking them outright. This represents a shift from the previous Biden administration, under which such a large railroad merger was widely seen as politically and regulatorily unviable amid a broader push against industry consolidation.

Union Pacific and Norfolk Southern argue that the merger would improve service reliability, shift freight from trucks to rail, preserve shipper choices, protect union jobs, and deliver broad economic and environmental benefits. As the first major railroad merger reviewed under the tougher post-2001 framework, the outcome is expected to set an important precedent for future consolidation in the U.S. rail industry.