Oops, 300kph is what I should of said. I dont think it's too greater stretch to see a mk4 at 200mph. A short set managed 161mph back in the late 80's on normal track without too much bother, with the advance in tech since then it should be possible. The BT41 bogies as used under the mk4 has now been upgraded as the sig300, which is meant for 300kph running.
When the 91's were running with a hst power car at the other end of the train acceleration was quite rapid with over 8000hp, I can only imagine what it would be with 12000+hp on tap.
It would be nice to beat our own record again.