The competition from Detroit Diesel, Cummins, and to a lesser extent Navistar (International) has driven Cat to stick with their off road design.
I drove Detroit DD15's for a while and they would be hard to compete with. But off road - like graders and such - Cat has the market all to themselves.
Marine engines are mostly Yanmar and Cat. The John Deere engines are actually Yanmar.
I don't think anyone really competes in both markets.
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