Cutting pressure drop by 20%: a new three-stage filtration system for high-power locomotives
The challenge: filtration that performs in the toughest rail environments
Rail OEMs operating high-power locomotives need filtration that does more than tick a compliance box. In high-dust, high-vibration, high-humidity environments, intake systems are expected to protect traction motors and sensitive equipment from prolonged exposure to water, dust and debris, while staying reliable over decades of service and remaining straightforward to maintain.
Our customer came to us with a specific brief. A filtration solution for 12,000 hp locomotives that met stringent EN standards, without compromising on efficiency, and with a meaningful reduction in end-to-end pressure drop. In other words, cleaner air, lower system resistance, and a longer, more predictable service life.
Starting with the application, not the catalogue
Rather than adapting an existing product, we started with the application. Our team in Noida worked closely with the customer to understand the operating environment, airflow profile, contamination challenges and maintenance realities of high-power locomotive operation.
That application-led approach is how our global engineering teams collaborate with rail OEMs. The goal is never simply to specify a filter, it is to design a system that protects critical assets, optimizes airflow and supports lower total cost of ownership across the locomotive's full life.
A bespoke three-stage filtration system
From that brief, we designed and developed a bespoke three-stage system to deliver optimal engine protection across the full range of operating conditions. A louver at the intake prevents water and large particles from entering the system, while our proprietary cyclonic filtering technology harnesses centrifugal force to remove dust before it can reach the engine. A woven media filter then delivers clean, dry air to the engine system, protecting against both wear and dust deposition or accumulation.
Together, the three stages provide more than 92% filtration efficiency in demanding locomotive environments, with the reduced pressure drop the customer needed to maintain engine output and efficiency.
Engineered, tested and manufactured under one roof
Our vertically integrated process in Noida gave us total control over design, testing and production, enabling a fast-track approach without compromising on quality. We built a purpose-built test rig that simulates real locomotive airflow, allowing us to validate performance to ISO 5011 standards before moving into production.
Following design optimization, we manufactured the filtration system in full compliance with EN61373, EN45545 and EN15085 - the core standards covering shock and vibration, fire protection, and welding of rail vehicles and components. That combination of in-house testing and standards-compliant manufacturing gave the customer a faster route to a system they could trust in service.
Lower pressure drop, longer service life, lower lifecycle cost
The result is a system that delivers 20% lower pressure drop than competitor systems, optimizing airflow and reducing overall system resistance. That translates directly into improved energy efficiency, enhanced engine output and more reliable operation across the locomotive fleet.
Durability was equally critical. The cyclonic tubes use chemical and heat resistant materials, with a design life exceeding 30 years, and the unit is rated for 960 hours of salt-spray resistance - important for coastal and high-humidity routes. To keep lifecycle costs down, we built the system around a modular design that allows for rapid servicing and simple part replacement. And because cleaner intake air supports more efficient combustion, the system also contributes to lower emissions and improved sustainability over the locomotive's life.
The bigger picture for rail OEMs
For Chris Showering, Product Management & Marketing Head, Global Rail, at IMI, the project reflects what modern rail customers expect from their engineering partners. In today's rail industry, performance, reliability and sustainability are critical," he said. "This project highlights our ability to harness deep collaboration and advanced engineering to transform complex technical needs into real-world performance through a complete, end-to-end solution that has not just met but exceeded customer expectations."
This project highlights our ability to harness deep collaboration and advanced engineering to transform complex technical needs into real-world performance through a complete, end-to-end solution that has not just met but exceeded customer expectations.
He added: "At our global manufacturing sites, including Noida, we are delivering solutions that not only meet today's challenges but are also shaping rail filtration technology through targeted innovation, which delivers scalable, repeatable solutions. As global rail networks continue to expand and modernize, we are ideally placed to lead - not just in product delivery - but in defining the future of performance-critical rail systems, through full-vehicle support from component design to system-level integration."
Why this matters for the future of rail
As rail networks expand, electrify and modernize, the pressure on every subsystem - from traction to filtration - continues to grow. OEMs need partners who can combine deep engineering expertise with local application knowledge and global manufacturing capability, and who can move quickly from brief to validated, in-service solution.
This project is a clear example of that approach: a customer-specific brief, an application-led design process, integrated testing and manufacturing, and a measurable performance improvement that supports cleaner, more efficient, more reliable rail operations.