The back story about problems with the four nacelle layout is a copy of the Constellation problems - since these are the only two Starfleet ships with four nacelles it seemed reasonable that they would both suffer from the same glitches. The stuff about the Galaxy class getting new speed requirements is from the TM, page 56/57, and it seemed reasonable that the Cheyenne would suffer accordingly if it was a slightly earlier ship.
Other than that it's mostly speculation. Since we haven't seen one single
Cheyenne in service over the years, I guess they must be small in numbers
and on their way out. If anybody has a better picture of this ship, I'd
appreciate it if you'd post me a copy.
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