SD60ACC Locomotive: Rebuild, Specifications, and Its Role in Modern Railroads

In the world of rail transportation, locomotive rebuilding programs have become essential for extending the lifespan of older locomotives while incorporating modern technologies. One notable example of this transformation is the SD60ACC locomotive, a rebuilt version of the classic SD60 model. With significant updates in technology, performance, and efficiency, the SD60ACC has become a critical player in modern railroad operations, allowing railway companies to improve their fleet without the costs associated with purchasing brand-new locomotives.

This article will explore the history of the SD60ACC, its rebuild process, key technical specifications, and the advantages it offers to the rail industry.

What is the SD60ACC?

The SD60ACC is a rebuilt version of the original SD60 locomotive, which was manufactured by the Electro-Motive Diesel (EMD) division of General Motors during the 1980s. The original SD60 was part of the SD series, renowned for its robust performance and reliability, primarily used by North American railroads for freight hauling. However, as these locomotives aged, railroad companies sought ways to upgrade their fleets without incurring the high costs of purchasing new locomotives.

The SD60ACC rebuild program is one of the solutions designed to modernize aging SD60s. The “ACC” in SD60ACC stands for Alternating Current (AC) Control Cab, indicating the significant upgrades made to the control systems and electrical components, particularly the conversion from direct current (DC) to alternating current (AC) traction motors.

The SD60ACC Rebuild Program

The SD60ACC rebuild program was spearheaded by Norfolk Southern (NS), a major railroad company in the United States. The program focused on converting older SD60 locomotives, many of which had been in service for over two decades, into more efficient and technologically advanced versions. The primary goals of the rebuild were to extend the service life of the locomotives, improve fuel efficiency, and enhance operational performance.

Key Upgrades in the Rebuild Process

The SD60ACC rebuilds are notable for the following key improvements:

• Conversion to AC Traction Motors: One of the most significant changes in the SD60ACC rebuild is the replacement of the older DC traction motors with newer AC traction motors. AC motors are more efficient, provide better adhesion in varying track conditions, and require less maintenance over time.
• New Electrical Systems: The rebuild includes the installation of advanced electrical systems, including new wiring and control systems, which allow for more precise and reliable control of the locomotive.
• Upgraded Cab and Control Systems: The “ACC” designation also highlights the completely redesigned cab, with modernized control systems that provide better ergonomics, safety features, and ease of use for the crew.
• Fuel Efficiency Improvements: Rebuilt SD60ACC locomotives are equipped with upgrades that optimize fuel consumption, making them more environmentally friendly and cost-effective in the long run.
• Emission Controls: Many SD60ACCs have also been fitted with updated emission control technologies, helping the locomotives comply with modern environmental regulations, such as the EPA Tier 0+ standards for emissions reduction.

Technical Specifications of the SD60ACC

The SD60ACC retains many of the core components of the original SD60 but includes significant upgrades that enhance its performance. Below is an overview of the technical specifications of the SD60ACC:

• Power Output: 3,800 horsepower (2,800 kW)
• Engine: EMD 16-710G3B (16-cylinder, two-stroke diesel engine)
• Traction System: AC traction motors (upgraded from the original DC motors)
• Length: 71 feet (21.64 meters)
• Weight: Approximately 400,000 pounds (181,436 kilograms)
• Fuel Capacity: 4,800 gallons (18,170 liters)
• Maximum Speed: 70 mph (113 km/h)

The switch to AC traction motors is perhaps the most notable upgrade, as AC motors offer better tractive effort, which is especially beneficial for hauling heavy freight over long distances and difficult terrains.

Advantages of the SD60ACC for Modern Railroads

The SD60ACC rebuild offers several advantages for railroad companies, particularly in terms of cost savings, performance enhancements, and sustainability. Here are some of the key benefits:

1. Cost-Effective Fleet Modernization

One of the primary reasons for the popularity of the SD60ACC program is the cost savings it offers compared to purchasing brand-new locomotives. A rebuild costs significantly less than acquiring a new AC locomotive while still delivering many of the same benefits, such as improved fuel efficiency and performance. By upgrading existing SD60 locomotives, companies can modernize their fleet without the substantial capital investment required for new units.

2. Extended Service Life

The SD60ACC rebuild program extends the life of the original SD60 locomotives by 20 to 30 years. This longevity allows railroad companies to continue using these reliable machines for many more years, getting the most out of their initial investment. With updated components and systems, the SD60ACC is designed to handle the demands of modern rail operations.

3. Enhanced Performance and Reliability

With the switch to AC traction motors and other electrical upgrades, the SD60ACC offers superior performance compared to the older SD60 models. The improved tractive effort and adhesion allow these locomotives to handle heavy loads more effectively, particularly in challenging conditions such as steep gradients or adverse weather. Additionally, AC motors are more reliable and have lower maintenance requirements, further reducing operational costs.

4. Fuel Efficiency and Environmental Compliance

Fuel efficiency is a crucial factor for railroads aiming to reduce operating costs and minimize environmental impact. The SD60ACC rebuild includes several enhancements that optimize fuel consumption, making these locomotives more environmentally friendly. Emission control technologies help the locomotives meet modern environmental standards, such as EPA Tier 0+ emissions regulations.

5. Improved Safety and Comfort for Operators

The redesigned cab in the SD60ACC provides better ergonomics and modern control systems for the operators. The upgrade includes more comfortable seating, enhanced visibility, and improved instrumentation, all of which contribute to safer and more efficient operations. The inclusion of advanced safety systems further ensures the well-being of the crew.

The Role of the SD60ACC in Modern Railroads

The SD60ACC has become an important part of the locomotive fleet for several major railroads, including Norfolk Southern. These rebuilt locomotives are used primarily in freight service, where their enhanced pulling power and efficiency allow them to handle long trains over vast distances. They are especially valuable in heavy haul operations, where the benefits of AC traction motors—such as better performance on steep grades and improved adhesion—are most noticeable.

In addition to their role in freight operations, SD60ACCs also serve as a model for other rebuild programs across the rail industry. As railroad companies continue to seek cost-effective ways to modernize their fleets, rebuilds like the SD60ACC demonstrate how existing locomotives can be upgraded to meet the demands of modern rail transportation without the need for new purchases.

Frequently Asked Questions

What does SD60ACC stand for?
SD60ACC stands for a rebuilt version of the original SD60 locomotive, with “AC” indicating alternating current traction motors, and “C” referring to the control cab upgrades.

Why are AC traction motors better than DC motors in locomotives?
AC traction motors offer better performance, especially in terms of tractive effort and reliability. They are more efficient, provide improved adhesion, and require less maintenance compared to DC motors.

Who operates the SD60ACC locomotives?
Norfolk Southern is one of the primary operators of the SD60ACC locomotives, using them for freight services across its extensive rail network.

How does the SD60ACC compare to new locomotives?
The SD60ACC offers many of the benefits of modern locomotives, such as AC traction, improved fuel efficiency, and environmental compliance, at a lower cost due to its rebuild status. It provides a cost-effective alternative to purchasing new locomotives.

What are the environmental benefits of the SD60ACC?
The SD60ACC features improved fuel efficiency and emissions control technologies, helping it meet modern environmental standards such as EPA Tier 0+ regulations.

Conclusion

The SD60ACC locomotive represents a successful example of how the rail industry can modernize existing fleets while keeping costs under control. With key upgrades such as AC traction motors, improved fuel efficiency, and extended service life, the SD60ACC has become a valuable asset for railroad companies like Norfolk Southern. Its role in freight transportation highlights the importance of locomotive rebuild programs in ensuring that aging fleets can meet the demands of modern rail operations.

As more railroads look to rebuild and upgrade their locomotives, the SD60ACC serves as a model for how older machines can be transformed into powerful, efficient engines that meet the needs of today’s industry.