Galaxy class was a rating for a passengerstarship. Large and luxurious, they could go for years between planet
File:The Thrasymachus.png
The Thrasymachus Galaxy Class Starliner
fall and typically could produce their own air. They were in use in the 44th and 51st centuries.
The Thrasymachus was a Galaxy Class starliner on which Amy Pond and Rory Williams honeymooned. It almost crashed until the Eleventh Doctor and Kazran Sardick had Abigail Pettigrew sing the skies calm. (DW: A Christmas Carol)
The Byzantium was a Galaxy Class starship that Weeping Angels crashed onAlfava Metraxis. (DW: The Time of Angels)