ok, here is another controversial assertion:
The Steamrunner, Saber, and Norway Classes are predominantly non-starfleet, not only that, but the designs may not be just neutral civillian, but actually Marquis.
Ok, if I haven't been banned from the board yet, maybe you can hear me out just a bit more:
Reasoning for them being civilian designs:
1. I have seen no onscreen evidence (on screen, not publicity shots, on screen) of any of those three classes carrying Starfleet markings or registries.
2. The overall shape of the ships are of significant departure from standard starfleet vessels up to that point, furthermore, they are departures from all shown future or experimental designs. For example, the Enterprise G (I think G) from Enterprise, Prometheous, Wells, Dauntless, Rhode Island, and Pasteur all suggest a much less angluar and for the most part, posess a more standard look.
3. The angular/utilitarian looks of the ships scream economy-centered designs.
4. The Norway has a large rectangular slot between its warp engine nacelles. This slot would be very conducive for some sort of bulk container transport. If not, what is it for???
5. Most civilian ships (as few and far between as they are) shown have their warp engines integral of the hull.
So why do we see these designs in battle scenes in First Contact and DS9 if they are not starfleet? Because the independent Marquis found that they had a common, greater enemy then the Federation. In one case the Borg, in the other the Dominion. "My enemy's enemy is my friend."
But didn't the Dominion wipe out the Marquis? Dispite apparent severe losses to the Marquis, can you ever garantee that you have wiped out a group of people fighting for their home on their home turf especially those who employ terrorist or semi-terrorist tactics?
But what about that screenshot showing Voyager's tatoo commander guy standing in front of a diagram of starfleet ships and a Norway? We don't really know what that diagram was trying to show. Maybe it was a set of ships by the same name, maybe it was the ships that One of the officers had served on. Could be a set of ships that a shipyard put out in a record amount of time. Starfleet may own a few bulk freighters much like modern navies do.