Tritium class

The Tritium-class was an experimental type of Federation starship serving in the first decade of the 23rd century. (Star Trek Spaceflight Chronology)

The Tritium-class has the dubious distinction of being the worst major ship ever built by the Federation. Its tri-nacelle design in theory should have given it added power and performance, but unavoidable imperfections accentuated warp field flaws and fluctuations actually lowered efficiency and performance. During the Tritium 's shakedown (which, given its flaws, actally did involve quite a bit of shaking), chief engineer Rex Opperman called it a "real Lemarian lemon" and revived an old term for a design fiasco: an Edsel.

A total of seven examples of the Tritium-class were built, none of which managed to complete a standard tour of duty as they were too often taken out of service for repairs or attempts to compensate for their basic flaws. As a costly reminder to future generations, the Tritium may be viewed as the Spaceflight Museum on Memory Alpha. (Star Trek Spaceflight Chronology)

Service Life
The Tritium was commissioned in 2148 SFC and all seven of the class were decommissioned by 2155 SFC. A class of shuttlecraft developed for the Tritium was somewhat more successful, remaining in service until 2173 SFC.
 * There are very few solidly-dated events in this period which can be used to help adapt dates from the SFC timeline to the standard timeline. By prorating the dates for the period of time between the end of the Romulan War (2109 SFC/2160) and the commissioning of the (2188 SFC/2245), we can arrive at approximate dates for the Tritium'': commission circa 2201, decommission by 2210, and the shuttle in operation until the late-2220s.