So much so, the heavy machinery company claims to have more than 1 million on-highway in-house engines still in use ...

Caterpillar's Defense and Federal Products is supplying Marinette Marine Corporation propulsion engines and generator sets on the lead ship of a new planned fleet of approximately 18 U.S. Coast ...

First introduced in 1898 (with a steam engine), the semi-truck continued to see improvements over the decades like the addition of the diesel engine, air brakes, and electronic systems.