Others have answered your original question, so I won't bother, but in the future if you have any concern at all about what train you might catch, just do the following: book your tickets in advance over the internet. The critical thing is to make sure you book each leg of your trip separately. That way, you can avoid printing out a ticket coupon until right before you get on the train (using Quik-Trak) and thus, if you find yourself with the need to change the train time, you can call 1-800-USA-RAIL and do the change over the phone before you get to the station. This avoids the (often huge) hassle of having to stand on line at the station ticket counter to change a paper ticket that you're already holding.