While I am not doubting what RKA said, the response from Amtrak seems just a little bit fishy to me. First, the schedule change is October 27th, not November 1st, so it would seem odd that a speed limit change causing a schedule change would not take effect until 5 days later. Amtrak is not going to reprint their timetables 5 days after they have taken effect.Secondly, why would Amtrak call about a change to arrival time, and one that is earlier? I would understand more if it were a change in departure time but coming into the destination station 40 minutes sooner can only be a pleasant surprise, and that assumes the train stays on time. If there is a 40-minute delay, considered very reasonable timekeeping for a 3-day trip, then guess what? No noticeable change.
And last, I strongly doubt that Amtrak telephone clerks know anything about the speed limits over freight railroads. I would bet if asked, that clerk did not know where the 90-mph limit was in effect, or what the limit was before it was raised. Trust me, the people on this board and other railfan forums know a lot more than the reservations people at Amtrak.