Union Pacific applies white paint to railroad rails to prevent heat-related derailments

Innovative Approach to Rail Safety

Union Pacific has started painting the sides of its steel rails white as a means to manage heat-related track conditions. This initiative is part of a broader strategy that led to the company's best-ever full-year derailment rate in 2025, reflecting a 19% improvement compared to the previous year.

Understanding Track Misalignment

According to Rod Doerr, chief safety officer at Union Pacific, steel rails can expand significantly during extreme heat, leading to what is known as thermal misalignment. If the rail does not have room to expand, it can push sideways, creating potential derailment risks.

Temperature Reduction via Reflective Paint

The white paint used on the rails serves to reflect sunlight, resulting in a decrease in the rail's surface temperature by approximately 20 degrees Fahrenheit. This reduction in temperature lowers the risk of the rail shifting due to heat, enhancing overall safety.

Deployment in High-Heat Areas

Union Pacific began applying this technique in targeted high-heat locations last year, supplementing traditional rail maintenance practices such as regular inspections and rail anchoring. Doerr noted that no other U.S. railroad has adopted this method yet, although it has been effective in Europe.

Cultural Shift Towards Safety Innovation

This initiative has sparked discussions among staff about innovation in rail safety, highlighting Union Pacific’s commitment to integrating proven practices with innovative strategies. Employees have embraced the question of why this method was not utilized earlier, showcasing a strong culture of safety and continuous improvement.