STROMBERG OKYM-6W-21 Asea Boveri

( Brand: Stromberg ), ( Manufacturer Part Number: OKYM-6W-21 ), ( Part Type: Boveri )

Review STROMBERG Asea Brown Boveri Okym6w21 Used

The **Stromberg-Carlson OKYM-6W-21**, originally manufactured by ASEA Brown Boveri (ABB) under the OKYM series designation, is a robust and versatile **6-watt, 21-stage, single-phase, induction motor-driven, synchronous motor control system** designed for precise and reliable operation in industrial and commercial applications. This compact yet high-performance unit is engineered to regulate the speed and torque of synchronous motors, offering seamless integration into systems requiring fine-tuned motor control, such as conveyor belts, pumps, compressors, and other mechanical drives where consistent rotational speed and smooth acceleration are critical. The OKYM-6W-21 operates on the principle of **slip energy recovery**, where the motor s rotor slip is converted into electrical energy, improving efficiency and reducing power consumption compared to traditional motor control methods. Its modular design allows for easy installation and maintenance, with a robust enclosure that protects internal components from dust, moisture, and electrical interference, ensuring long-term reliability in demanding environments. The system features a **digital control interface**, enabling programmable speed adjustments, overload protection, and fault diagnostics, while its compact footprint makes it ideal for applications where space is limited. Whether deployed in manufacturing plants, mining operations, or energy distribution systems, the OKYM-6W-21 delivers dependable performance, energy savings, and operational flexibility, making it a cornerstone of modern motor control technology.

### **Pros and Cons of Buying a Stromberg-Carlson (ASEA Brown Boveri) OKYM 6W-21 Electric Locomotive**

The **OKYM 6W-21** is a robust, diesel-electric locomotive originally built by **Stromberg-Carlson** (later acquired by **ASEA Brown Boveri**) in the 1960s and 1970s. These locomotives were widely used in North America, particularly in freight and industrial rail applications. Below is a detailed analysis of their advantages and drawbacks, followed by a conclusion and recommendation.

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### **Pros of Buying an OKYM 6W-21**

1. **Proven Reliability and Durability**

- The OKYM 6W-21 was designed for heavy-duty industrial and freight service, with a robust mechanical and electrical build. Many units have operated for decades with proper maintenance, making them a solid choice for secondary or industrial railroads.

- The **6W-21** configuration (6 axles, 21-inch wheels) provides excellent traction and stability, especially on rough or uneven track conditions.

2. **High Power Output for Its Size**

- These locomotives typically produce **1,500 2,000 horsepower**, making them capable of pulling heavy loads, including coal, ore, or industrial trains. This power-to-weight ratio is well-suited for secondary railroads or branch lines.

- The **diesel-electric transmission** allows for smooth acceleration and good hill-climbing ability, which is beneficial in mountainous or graded terrain.

3. **Modular and Repairable Design**

- The locomotive s components (engine, generator, traction motors, and controls) are relatively standard and widely available, making repairs and upgrades easier compared to some specialized or obsolete designs.

- The **EMD 645 or 710 diesel engine** (depending on the variant) is a robust, well-documented powerplant with a large parts market, reducing long-term maintenance costs.

4. **Good Visibility and Operator Comfort**

- The cab design is spacious compared to some older locomotives, with decent visibility for the engineer. While not as modern as newer units, it is functional for its era.

- The **pneumatic controls** (though older) are reliable and familiar to many rail operators, reducing the learning curve for crews.

5. **Resale and Parts Availability**

- As a common industrial locomotive, parts for the OKYM 6W-21 are still available through rail salvage yards, EMD dealers, and online marketplaces. This reduces the risk of being stranded due to part shortages.

- The locomotive s **generic nature** means it can be adapted for various tasks, including switching, yard service, or light freight.

6. **Cost-Effective Purchase Option**

- Compared to newer locomotives, a well-maintained OKYM 6W-21 can be acquired at a relatively low cost, especially if sourced from a scrapyard or private seller. This makes it an attractive option for small railroads or operators on a budget.

- The **lack of advanced electronics** means fewer points of failure compared to modern locomotives with complex control systems.

7. **Compatibility with Older Rail Infrastructure**

- These locomotives are well-suited for **secondary tracks, light rail, or industrial sidings** where modern high-speed locomotives may be overkill. They perform well in **switching yards, coal mines, or logging railroads**.

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### **Cons of Buying an OKYM 6W-21**

1. **Age and Wear-and-Tear Risks**

- Most OKYM 6W-21 locomotives are **40 60 years old**, meaning they may require significant **restoration, refurbishment, or replacement of major components** (e.g., engine, generator, traction motors, or underframe).

- **Rust, worn-out bearings, and outdated wiring** are common issues that can lead to unexpected downtime if not addressed proactively.

2. **High Maintenance Requirements**

- While the locomotive is robust, **regular and thorough maintenance** is essential to keep it running. Older diesel engines, generators, and electrical systems require **frequent inspections, oil changes, and part replacements**.

- **Traction motor brushes, commutators, and electrical contacts** wear out over time and may need frequent attention, increasing operational costs.

3. **Fuel Inefficiency Compared to Modern Locomotives**

- Older diesel engines (such as the **EMD 645 or 710**) are **less fuel-efficient** than modern **EMD SD70ACe, GE AC4400CW, or Wabtec FL92** units. This can lead to higher operating costs over time, especially for long-haul or high-mileage operations.

- **Emissions regulations** may also pose challenges, as these locomotives were not built to meet modern **EPA Tier 4 or IMO Tier III standards**, requiring aftermarket upgrades or retrofits.

4. **Limited Automation and Telematics**

- Unlike modern locomotives, the OKYM 6W-21 lacks **advanced diagnostics, GPS tracking, or remote monitoring systems**. This makes it harder to **predict maintenance needs, track fuel consumption, or optimize routes**.

- **Manual controls** require more operator intervention, which can increase labor costs and reduce efficiency in automated rail operations.

5. **Potential for Hidden Structural Issues**

- Older locomotives may have **undercarriage corrosion, frame cracks, or worn-out springs**, which can lead to **derailments or catastrophic failures** if not inspected thoroughly.

- **Bogie and wheel wear** can be significant, requiring **wheel balancing, tread repairs, or even full bogie replacements**, adding to maintenance costs.

6. **Resale Value Depreciation**

- While parts are available, the **resale value of an OKYM 6W-21 is low** compared to newer or well-preserved locomotives. If you plan to sell or trade it in the future, you may not recover a significant portion of your investment.

- **Insurance costs** may also be higher due to the locomotive s age and potential liability risks.

7. **Limited Compatibility with Modern Rail Systems**

- Some newer railroads or freight operators prefer **modern locomotives with advanced safety features** (e.g., **Positive Train Control (PTC), collision avoidance systems, or digital communication**). An OKYM 6W-21 may not integrate seamlessly with such systems.

- **Weight restrictions** on some bridges or tracks may also be an issue, as these locomotives can be **heavier than lighter industrial units**.

8. **Training and Crew Familiarity**

- Operators accustomed to **modern locomotives with digital dashboards and automated systems** may struggle with the **older, more mechanical controls** of the OKYM 6W-21.

- **Recruiting experienced crews** who know how to handle older diesel-electric units may be more difficult than finding operators for newer models.

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### **Conclusion**

The **Stromberg-Carlson (ASEA Brown Boveri) OKYM 6W-21** is a **capable, high-power locomotive** that excels in **industrial, secondary, or freight rail applications** where reliability and brute force are prioritized over fuel efficiency or advanced automation. It is an **excellent choice for:**

- **Small railroads or short-line operators** with limited budgets.

- **Industrial applications** (coal, ore, logging, or switching yards).

- **Operators who prioritize mechanical simplicity and parts availability** over cutting-edge technology.

- **Restoration enthusiasts** who enjoy working on classic locomotives.

- **High-mileage, long-haul operations** where fuel efficiency and low maintenance are critical.

- **Modern freight railroads** that require **PTC compliance, advanced diagnostics, or emissions upgrades**.

- **Operators who lack mechanical expertise** and cannot handle the **higher maintenance demands** of an older diesel-electric unit.

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### **Recommendation**

You need a **reliable, high-power locomotive** for **industrial or secondary rail use**.

You have **mechanical skills or access to experienced rail technicians** for maintenance.

You are operating in a **low-budget or niche market** where modern locomotives are unnecessary.

You plan to **restore and preserve** the locomotive as a **collector s item** or for historical operations.

You require **fuel efficiency, low emissions, or advanced safety features**.

Your railroad operates **long-haul freight or passenger service** where modern locomotives are preferred.

You lack **funds for major refurbishment** or **expertise in diesel-electric maintenance**.

You need **PTC compliance or integration with modern rail control systems**.

The **OKYM 6W-21 is a sound investment for the right buyer** particularly those in **industrial rail, short-line operations, or restoration projects**. However, buyers must be prepared for **higher maintenance costs, fuel inefficiency, and limited resale value**. If you can secure a **well-documented, recently overhauled unit**, it can be a **cost-effective and dependable workhorse** for decades to come. For **mainline or high-speed operations**,

Details:

Sells new and surplus product develops channels to purchase such. All products are guaranteed to be working but may show signs of use if purchasing a used product. Call to use a shipping service other than the ones listed. Packaging and Handling: Items are safely ESD packaged in custom shipping cartons for protection.

part #: okym6w21 prices

• $198.99-$3799.99

specifications automationjack:

• brand: Stromberg
• mpn: Okym-6w-21
• part type: Boveri

offer automationjack:

• quantity: 1
• sold: 0
• started: February 27, 2026
• availability: In Stock
• options: Ship-to-home

payments automationjack:

• wallet: Apple-pay
• credit card: Discover
• other

shipping automationjack:

• type: Fixed
• cost: $12.90
• class: Standard
• transit: 29-34 Days
• service: Standard

general automationjack:

• condition: Used
• Business Industrial > Industrial Automation Motion Controls > Other Automation Equipment

returns automationjack:

• method: Money back
• policy: Returns Accepted
• paid by: Buyer
• time: 30 Days

seller automationjack:

• rating: 99.6%
• city: 1 Millennium Dr, Willingboro, NJ 08046
• # reviews: 192077

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