The first has been around for decades and probably at least sounds familiar: diesel electric. In a diesel-electric system, an internal combustion (IC) engine, which could be gas or diesel, is connected directly to an electrical generator. From this point on, the power in the system is transferred electrically to the propeller shaft via a motor controller and electric motor. The system may have multiple generators and multiple motors connected to a common electrical bus. Diesel-electric trains are common, and many large ships, such as the Queen Mary 2, also use diesel-electric power. By the strict definition this is not a hybrid, because there is no electric storage of energy — at least not enough to run the boat anyway.