Galaxy X class

The Galaxy X-class was a type of Federation starship, in Starfleet service at the end of the 24th century, and were expected to continue in service into the 25th century. It was a dreadnought subclass of the design. 

History and specifications
The Galaxy class was refitted at the turn of the 25th century, after the collapse of the Khitomer Accords in 2399. In response to increased hostility with the Klingons, the newly redesigned ship was equipped with a phaser spinal lance, phaser cannons and a cloaking device since Starfleet was authorized to develop and implement cloaking technology on selected ships.

The additional engine nacelle assembly greatly increased the ship's speed. 

By the year 2409, Galaxy X-class starships, like USS Victory (NCC-170147), were equipped with cloaking devices and served as flagships of fleets. 

In the same year, vessels of the class were used by the Terran Empire's Imperial Starfleet. One such vessel was the, which led a Terran invasion of the prime universe. 

In a possible future timeline, the USS Enterprise (NCC-1701-D) had been converted to the specifications of this class by the 2390s, although that reality was aborted when Q made Jean-Luc Picard aware of how his fate would unfold. 

Livery
In the 25th century, the design of the Galaxy X-class cruiser allowed its commanding officer to choose from different designs of livery, which could be modified further at starbases. These options were designated Type 1-6 and Veteran. 

Furthermore, the installation of deflector shields from specific factions modified the hull appearance, including shields from the Reman Resistance, the Breen Confederacy and the Dominion.