Industry Terminal Repowers 1972-Built Towboat With Mitsubishi Engines to Extend Service Life and Cut Emissions

Pittsburgh-based Industry Terminal and Salvage has completed a major repowering of the towboat Marne B, previously known as Kimberly Jane, replacing the vessel's original propulsion package with new engines selected for efficiency and regulatory compliance. The towboat was built in 1972 and has accumulated more than five decades of service on US inland waterways, making it representative of the ageing inland fleet that operators across the Ohio, Mississippi and related river systems continue to rely on for bulk cargo movements. Repowering a vessel of that vintage is a meaningful capital decision because it effectively extends the useful life of the hull by another engine generation, provided the structural condition of the vessel justifies the investment.

 

Engine Replacement Specification

 

The work was carried out by Laborde Products, which removed the vessel's existing pair of CAT 3512 main engines and replaced them with Mitsubishi S12R engines rated at 1,000 kW at 1,600 rpm. The engines were specified to match the operating profile and power requirements of the towboat, a selection process that is critical on inland waterway vessels because the balance between torque characteristics, fuel efficiency and operational duty cycle directly affects both running costs and reliability. Matching engine rating to the existing hydrodynamic performance of an older hull is typically more complex than installing equivalent engines on a newbuild, and it requires careful integration of the propulsion train, cooling systems and control architecture.

 

Regulatory Compliance and Emissions Positioning

 

The new Mitsubishi S12R engines are compliant with US Environmental Protection Agency Tier 3 emission standards for vessels operating on inland waterways. Tier 3 compliance is the operational benchmark for a significant share of the inland fleet, and upgrading a 1970s-era towboat to meet that standard represents a substantial improvement in the emissions profile of the vessel, particularly on nitrogen oxides and particulate matter. For operators working under increasingly visible scrutiny on inland waterway air quality, bringing legacy tonnage into line with current emissions standards is a practical way to improve environmental performance without committing to the longer capital cycle of a full newbuild programme.

 

Operator Rationale for Retention Over Replacement

 

Donald Checkan, vice president of operations at Industry Terminal and Salvage, framed the repowering as a decision driven by the vessel's long working history and the desire to keep it productive rather than retire it. That logic is consistent with the broader economics of the US inland towboat market, where the cost and lead time associated with newbuild replacements, combined with the relatively conservative pace of fleet renewal, make engine replacement programmes an attractive alternative for operators focused on extending the service life of proven hulls. A repower of this type typically represents a fraction of the cost of a new towboat and can deliver meaningful gains in fuel efficiency, reliability and emissions performance.

 

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Laborde Products' Cumulative Experience

 

The Marne B project is the second occasion on which Laborde has replaced CAT 3512 engines with Mitsubishi engines on a towboat, and the contractor applied lessons learned from the earlier installation to optimise the work on the current vessel. That cumulative experience is commercially relevant because repeatable conversion packages significantly reduce engineering risk and installation time, and they allow contractors to offer standardised upgrade paths to operators running similar legacy tonnage. For an inland fleet that includes a substantial population of vessels originally fitted with CAT 3512 engines, the availability of a proven Mitsubishi-based replacement configuration creates a clear template for future repowering work.

 

Owner Profile and Operational Context

 

Industry Terminal and Salvage is headquartered near Pittsburgh, Pennsylvania, and operates towing vessels, shipyards and stevedoring operations across US inland waterways. The integrated profile of the business is commercially significant because companies that combine vessel operations with shipyard and terminal services have greater flexibility to schedule and execute repowering work without depending entirely on external capacity, and they can often absorb the downtime associated with major engine replacements more efficiently than pure-play operators. That integrated operational model also allows the company to capture the benefits of the upgrade across multiple parts of its service chain, as improved towboat reliability directly supports the throughput of its terminal and stevedoring operations.

 

Broader Implications for the Inland Waterway Fleet

 

The Marne B repowering is a small-scale but representative example of a trend that is becoming increasingly important for the US inland waterway sector. A large share of the towboat fleet operating on the country's river systems was built in the 1960s, 1970s and 1980s, and owners face a multi-year challenge of balancing regulatory compliance, fuel efficiency and operational continuity. Repowering programmes that deliver Tier 3 compliance through proven replacement packages offer a practical pathway for extending the life of that fleet, and successful execution on individual vessels contributes to the broader operational case that structured engine upgrade programmes can meaningfully modernise a legacy fleet without requiring wholesale vessel replacement.