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Tomorrow, Union Pacific Railroad plans to introduce one of seven low-emission Genset locomotives that are being used at the Class I's Proviso yard in Chicago.

Gensets are designed to reduce nitrous oxide emissions up to 90 percent and particulate matter emissions up to 80 percent, and cut fuel usage by more than 30 percent compared with older conventional locomotives.

UP pioneered the development and construction of the first Genset switcher in 2005 and currently operates the world's largest fleet of ultra-low-emitting Gensets, UP officials said in an event announcement. UP General Director of Car and Locomotive Engineering Mike Iden envisioned the packaging of an ultra-low emitting diesel engine, electrical generator and cooling system radiator in one compact, easily replaced module called a generator set, or Genset, they said.

Iden and other UP officials plan to attend tomorrow's introduction event, along with Cook County Board President Toni Preckwinkle, Respiratory Health Association of Metro Chicago Director of Environmental Health Programs Brian Urbaszewski, Chicago Metropolitan Agency for Planning Executive Director Randy Blankenhorn and U.S. Environmental Protection Agency Region 5 Mobile Source Program Manager Frank Acevedo.