American Cruise Lines said Monday it will name its fourth modern riverboat the American Melody.

The American Melody is expected to begin cruising in late 2020, joining the American Song, American Harmony and American Jazz in the company's planned fleet of five vessels with a modern design rather than the paddlewheel design of most domestic riverboats.

In addition to large staterooms with contemporary design and the latest in technology, the ships feature a bow that opens for a retractable gangplank. 

The American Song was the first to launch last year. American Harmony is readying for its inaugural cruise from New Orleans on Aug. 17, and the American Jazz is scheduled to join the fleet in 2020.

Details about the fifth planned ship haven't been released.

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