I work for Cummins also. Worked at same plant as 4520BW for 9 years before transferring to a Cummins Emissions Solutions plant in Wisconsin.
I have no real inside information. But I know that Cummins/Cummins Westport supplies vast majority of the mid-range and heavy duty on-highway natural gas truck engines used in the US. We make the 3-way catalysts used with them here. Cummins has been in that market for many years.
Cummins also makes many high horsepower natural gas engines (up to 91L). During my time in Indiana used to make quite a few natural gas K and QSK19 engines. Numerous different versions. I was the engineer of the production test cells and would test all of them off the assembly line. I have heard they have not made as many in the last few years, though.
Cummins is also invested and researching into battery/electric powertrains as well as fuel cells. For example Blue Bird uses Cummins for their electric school buses (https://www.blue-bird.com/buses/electric-school-buses). Have to be forward thinking to have a future. Hopefully it works out.
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