Caterpillar is a company that manufactures engines, among other heavy equipment. The C18 is a specific model of engine, known for its power and durability. It's not a type of vehicle itself, but rather an engine that can be used in various types of vehicles, such as:
* Trucks: Heavy-duty trucks, semi-trailers, and dump trucks.
* Construction Equipment: Excavators, loaders, bulldozers, and other heavy machinery.
* Marine Applications: Tugboats, ferries, and other large watercraft.
* Generators: Large power generators used for industrial or commercial purposes.
To determine the specific vehicle you're interested in, you'd need to provide more context, such as the make and model of the vehicle or the application it's used for.