Star Trek Expanded Universe

The USS Swiftfire (NCC-76125) was a Federation Excelsior-class exploratory cruiser that saw service during the 24th century. (Star Trek: The Farthest Star)

The Swiftfire was launched in 2310 and spent the majority of its service with the Starfleet Fifth Fleet.

By 2374 the Swiftfire had been replaced by the USS Swiftfire (NCC-76125-A). (Star Trek: The Farthest Star: "A New Path")