If I have a "train" at the "platform" and wish to send the train accelerating to near-C velocity in near-zero time from my frame. I presume that there is no theoretical limit on the acceleration (as far as SR goes). I presume that the clocks throughout the train will all appear barely to have moved in my frame after acceleration. If this all has no issues, my question would be: What do observers on the train make of the great desynchronization which has taken place between the clocks on board. Thank you.