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Meeting The ULEL Standards

Tognum’s new locomotive engines designed to meet ultra-low emissions standards

Posted on September 13, 2012

Tognum will introduce new MTU Series 4000 R54 locomotive engines to North America for the U.S. EPA Tier 3 and California Air Resources Board’s Ultra Low Emission Locomotive (ULEL) emission standards.

The 12- and 16-cylinder engines are rated at 1800 and 2400 kW, respectively, and will meet the emission standards without exhaust gas aftertreatment. Typical applications for this power range are switcher locomotives, road switcher locomotives and high speed trains.

The engines will be available in 2013, and be the first engines for single-engine locomotives with traction power in the range of 1491 to 2237 kW capable of meeting California ARB ULEL limits, Tognum said.

Cooled exhaust gas recirculation will be used as a core technology inside the engine to reduce nitrogen oxide levels. The two-stage turbocharging system ensures that there is sufficient air available for efficient and low-soot combustion in all operating conditions, such as extreme temperature conditions, high elevation or in the event of high exhaust gas back pressure, Tognum said.

The two-stage turbocharging also allows throttle-response times comparable to traditional single-engine switcher and road switcher locomotives. Intake valve control based on the Miller cycle makes it possible to lower the nitrogen oxide levels and simultaneously reduces fuel consumption, the company said. MTU’s third-generation common-rail injection system, which provides a maximum injection pressure of 2,200 bar, ensures low particulate emissions.