Quote:
Originally Posted by martok2112
Then, they changed it up again in All Good Things when the Super Enterprise and Dr. (Capt.) Crusher's medical ship could apparently achieve warp 14-15.
Gaaaaahhhhhhhh!!!!!!!!!!!!!!!!!!!!! 
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Then again, that timeline never really happened
The other point I made is that the "modifications" in those TOS episodes seemed to apply only to the engines, but it was implied in other episodes that greater speeds were "unsafe" due to loss of hull integrity, i.e to enable the ship to continuously travel at >warp 10 would have required structural redesign as well as engine modifications.