NS, Progress Rail Collaborate to Upgrade 96 Locomotives

Why It Matters

Extending asset life and cutting operating costs strengthens NS’s competitive edge while advancing industry‑wide sustainability goals.

Key Takeaways

• 96 NS locomotives to receive AC traction by 2029
• Reliability improves 40%, haulage capacity rises 55%
• Fuel efficiency gains of 3% per converted unit
• Conversions add at least 20 years service life
• Reduces NS engine models from 13 to four by 2030

Pulse Analysis

Railroads across North America are accelerating the shift from DC‑traction to AC‑traction locomotives, a move driven by higher tractive effort, lower maintenance and better fuel economy. Norfolk Southern’s partnership with Progress Rail to convert 96 SD70M‑2 units exemplifies this trend. The program, slated for delivery between 2027 and 2029, will replace legacy DC systems with individual‑axle control and Caterpillar’s ADEM® engine management, delivering 4,300 hp from remanufactured EMD 710 engines. The upgrade positions NS among the few Class I carriers with a majority‑AC fleet.

The technical package promises measurable performance gains: a 40 % reliability uplift, 55 % increase in haulage capacity and a modest 3 % fuel‑efficiency improvement. Extending each locomotive’s service life by at least two decades reduces capital expenditures compared with purchasing new power units, while simplifying the fleet from 13 engine families to four. This consolidation cuts spare‑parts inventories, streamlines technician training and lowers tooling costs, directly supporting NS’s roadmap to reduce operational complexity and meet its sustainability targets through lower emissions per ton‑mile.

From a market perspective, the conversion program signals that retrofitting existing assets can be a cost‑effective path to modernization for legacy railroads. Progress Rail’s involvement showcases the growing role of original equipment manufacturers in delivering turnkey upgrades rather than solely new builds. As NS continues to lead industry metrics such as Fly Rate, the enhanced reliability and capacity of the upgraded fleet could improve network fluidity, attract higher‑value freight, and set a benchmark for peers evaluating similar DC‑to‑AC projects. The initiative underscores the strategic importance of technology‑driven asset management in the rail sector.