Section: Antitrust
What happens when a country runs on two railroads
The antitrust question is bigger than this one deal. Approving it likely forces the last round of railroad consolidation in American history. Here is the argument, step by step.
Step 1: The industry is already concentrated
In the 1980s, more than 30 major freight railroads competed in the U.S. Waves of mergers cut that to six Class I carriers today, and four of them handle about 90% of U.S. freight rail traffic. Most shippers already have, at best, two railroads to choose from. Many have one. Economists call those "captive shippers," and they pay for it in rates and service.
Letter of 40+ Members of Congress to STB, Feb. 4, 2026 (filing 310838); Not Another Houston community fact sheet, Mar. 2026.Step 2: This deal creates a coast-to-coast giant
A combined UP-NS would run roughly 55,000 miles of track and handle nearly half the nation's rail freight. No single railroad has ever spanned the continent. Scale like that changes bargaining power with every shipper, port, and connecting railroad on the network.
STB filing 310838; UP-NS merger application, Docket FD 36873.Step 3: The "end-game" problem
BNSF and CSX would face a transcontinental competitor they cannot match alone. Industry observers widely expect a UP-NS approval to push BNSF and CSX toward their own merger, leaving two transcontinental giants plus CPKC. The STB saw this coming 25 years ago. Its 2001 merger rules specifically warn about an end-game in which only two or three transcontinental carriers remain, and require applicants to address those downstream effects. CPKC's filing argued UP and NS gave the Board a three-paragraph brush-off on the single most important question in the case.
STB Major Merger Rules, 5 S.T.B. 539, 582 (2001); CPKC completeness comments, Dec. 29, 2025, STB filing 310605, at 17.What do fewer railroads mean for regular people?
Freight rates ripple through everything. Grain, chemicals, cars, fuel, and consumer goods all move by rail. When shippers lose competitive options, rates rise and service slips, and those costs land in grocery stores and utility bills. The nine Republican attorneys general made exactly this argument: concentration means higher prices, lower reliability, and less innovation, paid for by American manufacturers and consumers.
Letter of nine state attorneys general, Nov. 14, 2025, STB filing 310163.Didn't past mergers promise efficiency too?
Every one of them did. The 1996 UP-Southern Pacific merger promised improved service and delivered a months-long meltdown centered on Houston, with trains backed up across the western U.S. and billions in economic damage. The 1997-99 Conrail split caused its own service crisis in the East. Complaints from shippers, workers, and divided communities after those deals are why the Board rewrote its rules in 2001 to demand that new mergers enhance competition, and why merger applicants now bear a heavier burden of proof.
STB Major Merger Rules, 5 S.T.B. at 546; letter of 40+ Members of Congress, Feb. 4, 2026 (filing 310838).What does the law actually require?
The Board can approve a major merger only if it is consistent with the public interest. Its regulations say mergers serve that interest only when substantial, demonstrable gains in service, safety, competition, and efficiency outweigh anticompetitive effects, service disruption risks, and other harms. The railroads must prove the benefits. The public does not have to prove the harms.
49 U.S.C. § 11324; 49 C.F.R. § 1180.1(c).Where the antitrust case stands
The January 2026 rejection turned partly on this issue. The Board found the application failed to include the market analysis needed to evaluate competitive effects, and lacked the full merger agreement, including schedules that may bear on competition. Rival railroads showed the traffic projections underlying the whole application rested on data the railroads refused to produce. The revised application now has to answer those questions on the record, where the public and the Board can test them.
STB Decision, Docket FD 36873, served Jan. 16, 2026; CPKC filing 310605, at 8.Since then, the fight has sharpened. The railroads argued in August that the law does not let the Board require them to enhance rail competition. BNSF read that as a signal they may appeal any order that does. The railroads' main competitive remedy covers about 0.9% of national traffic, applies at four gateways, and excludes intermodal and automotive freight, according to the seven-state attorneys general. On September 18 the Board refused to end the case early, saying more evidence will help it decide. The competition questions now get answered in the November 18 comments and the reply round that follows.
UP-94/NS-93 (Aug. 26, 2026); BNSF-53, STB filing 312262, at n.8; seven-state AG letter, STB filing 311922; Texas AG comment, filing 312118; STB press release PR 26-23 (Sept. 18, 2026).