Union Pac — Key Risks
Pending Merger With Norfolk Southern Carries Major Execution and Regulatory Risk
Union Pacific announced a merger agreement with Norfolk Southern in July 2025, but the deal faces a difficult regulatory path. The U.S. Surface Transportation Board (STB) already rejected the initial application in January 2026 as incomplete, forcing a restart of the review process. If the deal collapses, Union Pacific could owe Norfolk Southern a termination fee of $2.5 billion, and if it closes, integrating two massive railroad networks — neither company has done a deal of comparable scale before — carries substantial cost and operational risk.
International Trade Disruptions Could Meaningfully Shrink Revenue
A significant share of Union Pacific's freight connects U.S. markets to Mexico, Canada, and Southeast Asia. New U.S. tariffs and retaliatory measures from trading partners already hurt demand and raised costs during fiscal year 2025, and this pressure may continue into 2026. A sustained pullback in cross-border trade — from tariffs, policy changes, or geopolitical conflict — would directly reduce the volume of goods Union Pacific hauls.
Concentrated Supplier Base Creates Vulnerability for Locomotives and Rail
Union Pacific relies on just two domestic suppliers for locomotives and a limited number of steel producers for rail — both industries with high barriers to entry. If any of these suppliers fails, exits the market, or cannot meet emissions standards, the company could face significant cost increases and equipment shortages with few alternatives to turn to.
Hazardous Materials Transport Exposes the Company to Catastrophic Liability
Union Pacific is legally required under common carrier obligations to transport certain hazardous materials — including chlorine, crude oil, and ethanol — even when the risks are high. A serious accident involving these materials could generate personal injury, environmental remediation, and property damage claims that exceed the company's insurance coverage, with lasting reputational damage on top.
Fuel Costs Are Large, Volatile, and Only Partially Recoverable
Diesel is one of Union Pacific's biggest operating expenses, and prices can swing dramatically based on geopolitical events, weather, and supply disruptions. The company recovers some of this through fuel surcharges, but those surcharges lag actual fuel price changes by roughly two months, creating a mismatch that drives quarter-to-quarter earnings volatility and leaves some cost increases unrecovered.
Union Workforce Limits Operational Flexibility
The majority of Union Pacific's employees are covered by collective bargaining agreements. Strikes, slowdowns, or difficult contract negotiations can disrupt service and raise labor costs, and the company has limited ability to make unilateral changes to address sudden shifts in workforce needs. Labor disputes at ports or customer facilities can also ripple through Union Pacific's network even if its own workforce is not directly involved.
Severe Weather Can Knock Out Large Portions of the Network
Operating one of the largest rail networks in the U.S. means Union Pacific is constantly exposed to earthquakes, floods, wildfires, extreme temperatures, and other natural events. These events have caused line outages and service interruptions in the past, hitting both revenue and costs — and climate change may increase both the frequency and severity of such disruptions going forward.