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Next month, Union Pacific Railroad plans to begin using a sixth ultra-low-emission Genset switcher at its Roseville, Calif., yard.

The locomotive, which is being field tested at UP's Fort Worth, Texas, yard, will increase the Class I’s Genset fleet to 165 units. Gensets are designed to reduce oxides of nitrogen emissions up to 80 percent and particulate matter emission up to 90 percent compared with a conventional switcher.

"A lot of work is ongoing in terms of developing new and better locomotives and other vehicles," said Mike Iden, UP’s general director of car and locomotive engineering, in a prepared statement. "When calculating true fuel savings or greenhouse-gas emission reductions, it is important to include every step in the process as we do with the Genset."