Ferry
Most large diesel/electric propulsion ferry service is in Europe, where long histories encourage cultural demand for low pollution solutions. Recently, the economic and engineering advantages of modern electric propulsion have caused most new large ships to be designed as diesel/electric (or some other fuel oil).
This efficient combination of diesel generator and electric drive has dominated the expense sensitive train market for decades, and was used on Staten Island ferries in New York from WWII to 1964, when the Brooklyn-Staten Island bridge opened.
Washington state has the largest ferry service in the United States, and less than half their fleet are diesel/electric (the oldest ones and the newest ones). In the rest, a diesel engine directly turns propellers through a transmission or impellers for water jet drive.
This common industrial marine Diesel/electric series is functionally different than the new parallel hybrid drive, (usually for smaller boats) in which both the fuel engine and/or the electric motor can propel the boat. The larger boats can not store enough electricity to move the boat without the diesel motors running.