The RetroFitted Dorsal Carrier was a type of starship built in the far future. The design number XRT-550 was connected to this carrier, with at least one commissioned in the year 3125.
It appeared in the temporal observatory owned by Daniels. (ENT: "Future Tense")
- This information was shown next to the Vulcan command cruiser and the time travel pod on the observatory, and it is unclear if it referred to either of these ships.