Norfolk Southern Converting 96 Locomotives to AC Power by 2029

Key Details Norfolk Southern is partnering with Progress Rail to convert 96 direct current (DC) locomotives to alternating current (AC) power. The SD70ICC Tier 2+ AC units will arrive between 2027 and 2029, completing a major modernization initiative. Why It Matters AC-powered locomotives deliver superior performance on heavy, super-long trains. They generate higher tractive effort at low speeds without wheel slip and run continuously without overheating, a critical advantage for Class 1 operations. Performance Gains The upgrades will enable NS to operate fewer engines per train while improving reliability by 40% and increasing haulage capacity by 55%. Each conversion is 3% more fuel efficient and extends locomotive life by at least 20 years. Fleet Modernization Strategy NS already operates nearly 90% AC-powered equipment and is consolidating its fleet from 13 engine models down to four over the next decade. The carrier also ordered 40 new ES44AC locomotives in January, signaling its commitment to modern, efficient operations. Bottom Line These conversions strengthen network resilience while delivering cost savings and improved service for customers. It positions NS competitively as railroads push toward greater fuel efficiency and operational reliability.