Ten months after Union Pacific and Norfolk Southern shareholders voted overwhelmingly — 99% on both sides — to approve what would be the first coast-to-coast railroad in American history, the deal still hasn’t cleared its first real regulatory hurdle. It’s not dead. It’s not close to dead. It’s just moving at the pace federal agencies move, which is to say: slowly, in fits, with paperwork rejected and resubmitted and rejected again in ways that would frustrate anyone who assumed a merger this size runs on a normal corporate clock.
Here’s the timeline, because the timeline is basically the story. Union Pacific and Norfolk Southern filed their joint application with the Surface Transportation Board on December 19, 2025. The STB rejected it three weeks later, on January 16, unanimously, as incomplete — not a judgment on the merger’s merits, just a filing that didn’t meet the board’s own paperwork requirements under 49 C.F.R. part 1180, which for a transaction this size runs to hundreds of pages of required disclosures. The companies went back, refiled a revised application on April 30, and by late May the STB accepted it as complete — but immediately froze the whole proceeding in what regulators call “abeyance,” ordering both railroads to hand over supplemental information by the end of July. They did, splitting the disclosures into a July 7 batch and a July 27 batch, most of it apparently concerning entities Union Pacific jointly owns with other Class I railroads.
Then, on August 18, the STB finally moved the case into what it calls the “merits evaluation phase” — the actual substance of whether this merger should happen, as opposed to whether the application was filled out correctly. Anyone hoping that meant things would speed up got a reality check eight days later: the National League of Cities asked for more time, noting that roughly 12,000 local governments host rail crossings and most of them haven’t figured out yet whether they even want a seat at this table. The STB gave them until September 30 to decide.
None of that delay is really about doubt over whether the merger makes commercial sense. It’s about opposition, and the loudest opposition is coming from an unlikely source: Canadian National Railway, a competitor with no formal role in approving the deal but plenty of incentive to slow it down. CN told the board in May that the revised application resolved only one of three competition concerns it had raised, leaving two unaddressed — concerns that, if the STB takes them seriously, could mean divestitures or route concessions before any green light gets issued. Shippers, unions, and farm groups have filed their own objections, worried mostly about what happens to freight rates and service reliability once two of the country’s biggest railroads answer to one boardroom.
There’s a political undercurrent here too, and it’s worth naming directly rather than dancing around it. In late August 2025, Robert Primus — then a sitting STB member — said publicly that he’d received an email from the White House terminating his position, a move that landed just months before the board was expected to take up this exact merger. Whatever the intent behind it, the timing didn’t do much to quiet suspicions that this process carries more political weight than a typical infrastructure deal review usually does.
For Union Pacific shareholders, the wait has so far been kind. The stock is up roughly 20% over the past several months, and Third Point’s Dan Loeb has publicly named it one of his favorite large-cap holdings for the year, regulatory cloud and all. That’s not nothing — a stock doesn’t run like that purely on merger optimism if the underlying freight business weren’t also performing. But optimism and certainty aren’t the same thing, and the STB has been explicit, more than once, that accepting an application as complete “should not be mistaken for a determination on the merits.”
The companies still expect to close in 2027, which at this point looks less like a confident projection and more like the only date anyone can defend without knowing how the merits phase plays out. Deals this size — $85 billion, the first true transcontinental network in the industry’s history — don’t usually collapse over paperwork. They collapse, if they collapse, over the actual substance: competition, pricing power, whether Kansas City Southern’s old customers end up with fewer choices than they have today. That fight hasn’t started yet. September 4 was just the deadline to show up for it.
