Story perspectives

BNSF Railway Leads U.S. in NOx Emissions, Faces Regulations

12/14/2025

Summary

Story summary

In 2024, BNSF Railway produced 161,500 tons of nitrogen oxide, the largest NOx emissions among U.S. sources, surpassing coal-fired plants.
The fleet is aging, with an average locomotive age of 28 years, contributing to poor emissions performance.
Critics say the rail industry resists modernization because of fears of new regulations.
BNSF's fuel efficiency is the lowest among major railroads.
Proposed California regulations could ban older locomotives and enforce zero-emission standards.

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Story summary

In 2024, BNSF Railway produced 161,500 tons of nitrogen oxide, the largest NOx emissions among U.S. sources, surpassing coal-fired plants.
The fleet is aging, with an average locomotive age of 28 years, contributing to poor emissions performance.
Critics say the rail industry resists modernization because of fears of new regulations.
BNSF's fuel efficiency is the lowest among major railroads.
Proposed California regulations could ban older locomotives and enforce zero-emission standards.