The JEP, established in 1974, is one of the top five heavy-duty diesel engine producers worldwide with production in recent years typically exceeding 100,000 engines annually. The JEP also remains one of the company's largest manufacturing facilities, as it accounts for 12% of Cummins total engine production in 2012.
Jamestown is one of Cummins 28 worldwide manufacturing locations and produces many of the Cummins heavy-duty engines, including the ISX15, the ISX12 and the ISM diesel engines. The flagship ISX15 engine continues to be the top-selling engine in the heavy-duty truck market with Jamestown total production exceeding 677,000 ISX15 engines since 2003.
The plant is also in full production with the new high-performance Cummins Westport ISX12 G heavy-duty natural gas engine.