This Vulcan cruiser was a type of Vulcan starship that was commissioned sometime after 2152.
The Vulcan cruiser shared a similar design lineage with the Suurok-class, but instead of a single "hoop" warp nacelle, it contained three rings arranged in a clover-shaped arrangement.
Specifications for this starship class appeared in Daniels' database while Captain Archer and T'Pol were searching for specifications of a time travel pod that was suspected to be from the future.
Upon witnessing the starship class, T'Pol, who doubted the concept of time travel, was able to identify it as a Vulcan cruiser, but did not recognize the configuration.
Archer, who was determined to prove time travel was real, noted to her that she did not recognize it because it had not been built yet. (ENT: "Future Tense")
According to the text appearing next to the ship, on several occasions during the scene, this vessel may be a "RetroFitted Dorsal Carrier, Design XRT-55D, Commission Date 3125."