A class VI starship is a term for a classification of a starship.
History and specifications[]
Certain class VI starships have the power to tow large objects such as space stations. (FASA RPG module: Federation Ship Recognition Manual)
In 2369, Miles O'Brien told Kira Nerys he would need a class VI starship to move Deep Space 9 to a position near the Bajoran wormhole. (DS9 novelization: Emissary)
The USS Lantree had been fitted as a class-6 transport in the year 2365. (TNG episode: "Unnatural Selection")