Our world-first retrofit solution for diesel rail is proven in long-term, real-world operations. Eminox’s EMx S5 technology was first retrofitted to an early 1990s-built South Western Railway (SWR) operated Class 159 DMU in full passenger service between Waterloo and Exeter in 2019.
The implementation, carried out in partnership with South Western Railway (SWR) and rolling stock assets company Porterbrook, was funded by the Department for Transport through InnovateUK. Recognising the results it delivered it won in the Sustainable Business category of the 2020 National Rail Awards.
While based on Eminox’s successful emissions control systems, our rail solution has been adapted to meet the unique needs of the industry. This includes the development of suitable on-board urea storage, dosing, and air systems, ruggedised electronics units and fine tuning catalyst performance to meet rail duty cycles. 3D scanning is used to map out the space to fit the solution within the existing vehicle underframe.
With Eminox’s technology on-board, emissions performance not only meets, but exceeds Stage IIIB emissions targets. For the SWR Class 159 DMU, this meant it achieved results approaching the future Stage V standard. NOx emissions drop by over 80% in normal operations, along with a 90% reduction in hydrocarbons, carbon monoxide and particulate matter (PM). Over six months, the total NOx saving for the Class 159 DMU is 1,834.87 kg, equivalent to the output of 30 Euro VI double-deck buses over the same time. This equates to an annual NOx removal of more than 5,700 kg per system or 17,000 kg for a three-car DMU.
The retrofit system reduces emissions in multiple ways when in use. An oxidation catalyst and a wall-flow filter remove PM, including carcinogenic ultra-fine particles. NOx emissions are then reduced through urea-based selective catalytic reduction technology. The system is actively managed by an advanced Electronic Control Unit, calibrated to maximise emissions reductions over the course of operations.
There are currently almost 3,000 diesel rail vehicles on the UK network, the majority of which are still fit for purpose, with many years of operating life remaining. This fleet represents a significant investment that cannot simply or cost-effectively be replaced. In fact, SWR and Porterbrook calculate that replacing a three-car DMU costs around £4.5 million. In contrast an existing DMU can be retrofitted to deliver the same improvement in emissions for around £150,000. Eminox’s technology is directly applicable to a wide range of DMUs in service across the UK, providing fast deployments and recognised benefits and, a similar exhaust aftertreatment system is currently being trialled on a Class 170.
Emissions control specialist Eminox provides innovative design and engineering solutions to heavy-duty vehicle operators and manufacturers across the globe. Eminox has been the first to market for retrofit bus, truck, coach, and construction equipment applications approved by the Energy Savings Trust’s Clean Vehicle Retrofit Accreditation Scheme, and to date has upgraded over 7,000 diesel engines to meet the latest emissions regulations. Based in the UK, Eminox received the Queen’s Award for Enterprise in 2020.
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