I'm pretty sure that it would still be a guaranteed reservation, as the normal rule of thumb is 1 hour between connecting trains.I think it would be a worth a call to Amtrak to see what they say about it being guaranteed now that the time has changed. They may tell you to keep it guaranteed you need to leave STL earlier.Here is my itinerary with the LSLWhen I made the rezzie it was about an hour and a half between trains, now its like half an hour - enough to worry me. When I made the rezzie I was guaranteed, now ????
Should I make a new rezzie or just let Amtrak worry about it?
However you may feel more comfortable with a bigger window Rich and may wish to change things anyhow. There is a difference between being on your train going where you expected to go and spending an unplanned night in Chicago and possibly loosing out on your bedroom, even if Amtrak compensates you and pays for that overnight.