CSX has signed a $670 million agreement with Wabtec Corporation to upgrade its freight locomotive fleet with 100 new Evolution Series units, 50 modernized locomotives, and integrated digital solutions. The initiative targets fuel efficiency, tractive performance, and reliability across long-haul and heavy-duty rail operations.

Scope of the Fleet Upgrade

The agreement includes the delivery of 100 new Evolution Series locomotives and the modernization of 50 existing D9 units. The modernization program converts the D9 locomotives from direct current (DC) to alternating current (AC) traction systems.

AC traction technology enables improved adhesion control and higher tractive effort compared with legacy DC systems. In heavy freight applications, AC traction motors typically provide better low-speed pulling power and reduced wheel slip, which can translate into improved haulage capability and lower maintenance requirements over time.

The new Evolution Series locomotives are designed to reduce fuel consumption while maintaining the power output required for long-distance and heavy-load service. Improvements in fuel efficiency and reliability are intended to support network performance in high-volume freight corridors.

DC-to-AC Conversion and Lifecycle Extension

The modernization of aging D9 locomotives forms a central component of the program. Converting DC traction systems to AC allows integration of advanced control architectures and onboard diagnostics.

This approach extends the service life of existing assets while increasing fleet standardization. Standardized traction platforms can reduce spare parts complexity and simplify maintenance planning, which is particularly relevant for large rail networks operating across multiple terminals.

AC conversion also enables compatibility with digital control systems that optimize power distribution and monitor real-time locomotive performance. These systems support predictive maintenance strategies and improved asset availability.

Digital Control Systems and Fuel Optimization

Both the new and modernized locomotives will be equipped with Trip Optimizer featuring Smart Horsepower per Ton. The system is certified by the U.S. Environmental Protection Agency (EPA) and is designed to optimize throttle settings and power distribution based on train weight, route profile, and operational constraints.

By automatically adjusting locomotive output to match real-time conditions, the system aims to reduce unnecessary fuel consumption while maintaining schedule adherence. In heavy-haul rail operations, such digital optimization systems can contribute to measurable reductions in fuel burn and associated emissions, while also limiting mechanical stress on traction components.

The integration of digital tools alongside hardware upgrades reflects a broader shift toward data-driven fleet management within the rail sector. Embedding control and monitoring systems directly into locomotive platforms enables closer alignment between asset performance and operational planning.

Delivery of the new Evolution Series locomotives is expected to begin this year, while deliveries of the modernized AC-converted locomotives are scheduled to begin in 2027.

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