ah, but there's where the misunderstanding lies in the nature of how i wanted this thing to be. the acceleration applies to its total speed. it only goes back to its base speed upon selecting a new target. traveling in a circle vs traveling in a straight line does not affect its total speed. say that the target boarded a vehicle and traveled straight toward the object at 200mph while the object was travelling 50 mph, passing within a few feet of the object. the object would not then slow to a halt and begin accelerating from its base speed toward the target - it would continue after them at 50mph, plus its additional speed it has gained from acceleration during that time, say 51mph now instead. it is not a physical object affected by the physical world in that way.
so in chasing after a monorail, regardless of it travelling in a circle, if it was initially travelling at 4kph, after about an hour of pursuit it will be travelling at about 130kph(the normal acceleration is closer to 30m/s²). it only resets to its current base speed upon a change in targets.
otherwise yes, containment would have been a breeze. this is why the foundation had so many casualties in their initial attempts at containing it. the whole trick lies in having to change targets every so often, and doing so effectively.
*edit* also we're both using the wrong speed there. accelerating at 170m/s² would mean that after an hour it was travelling 612 kilometers per second. it will EVENTUALLY reach that speed, but not quite that fast :P the proper highest acceleration then would be about .047m/s², with the average being around .008 - .009m/s², which would translate to around an additional 100 - 120 kph per hour.