Dive summary:

• A new locomotive in General Electric’s new Evolution Series is the first locomotive to reach Tier 4 EPA standards, which among other things, must decrease exhaust emissions by more than 90% from previous Tier 3 ratings.
• The new engines will reduce emissions of nitrogen oxide by 76% and particulate matter by 70% from the 2005 model, which was already above Tier 3 ratings, securing their position in Tier 4.
• The new engine technology is the result of an initial six-year, $400m investment, followed by a two-year, $200m investment to fine tune any possible shortcomings.

From the article:

GE Transportation (GE) has unveiled a new locomotive as part of its ecomagination-qualified Evolution Series Locomotive family.

GE said that the new locomotive will be the first to meet the US Environmental Protection Agency's (EPA) Tier 4 emission standards, set to take effect in 2015.

Compared to engines first introduced in 2005, the new locomotive will decrease constituent emissions by more than 70%. ...