Travelin Gal,Thank you! Given the EB OTP I've been worried. Taking the train to WAS for my family was an experience they didn't want to miss, but we would really need to make the connection in CHI or we'd miss our other reservations in DC.
I just want to be clear here. Guaranteed means that Amtrak guarantees to get you there, eventually. It does not mean that you will make the connection. If you miss the connection, Amtrak guarantees to take care of you. That could mean a bus, it could mean holding the other train, or it could mean that they put you up in a hotel for the night and send you out on the next day's train.
But it does not mean that you are 100% guaranteed to make that connection on that day.