Vulcan command cruiser

The database information

The retrofitted dorsal carrier was a type of starship built in the far future. The design number XRT-55D was connected to this carrier, with at least one commissioned in the year 3125.

It appeared in the database owned by Daniels. (ENT: "Future Tense")

This information was shown next to the future Vulcan cruiser and the time travel pod in the database, and it is unclear if it referred to either of these ships.