Progress Rail PR30B

Progress Rail has repowered four-axle, GP-type locomotives with Caterpillar 3516C-HD engines rated at 2,995 hp and equipped with exhaust aftertreatment technology verified by the California Air Resources Board (ARB) to achieve the equivalent of U.S. EPA Tier 4 emissions levels.
The locomotives, set to operate in the railroad's namesake California region, will be equipped with a combination Diesel Oxidation Catalyst (DOC)/Selective Catalytic Reduction (SCR) emissions aftertreatment system to significantly reduce emissions of nitrogen oxide and particulate matter, Progress Rail said. Thanks to advanced Caterpillar DOC and SCR technologies, these locomotives are the cleanest diesel locomotives in their class as verified by the California Air Resources Board.
These locomotives are the first Tier 4-Line Haul locomotives in operation other than GE's 5 Tier 4 ES44AC's.
Source: http://www.railwayage.com/index.php/mechanical/locomotives/progress-rail-sets-short-line-locomotive-pact.html
Category:Diesel locomotives
Category:Four-axled diesel locomotives
Category:American locomotives
Category:DC Traction Locomotives
Category:EPA Tier 4
Category:Progress Rail Locomotive