You will need to go to the ticket window and exchange tickets for a later train. There will be no penalty, but they'll charge you for any difference in fare, and you'll lose the AAA discount too since most discounts require a 3-day advance purchase. There is also the slight risk that the next train could be sold out.
Then, what do you do if you miss your train?
Connecting to the same Carrier Speak to the train staff to find out if you can board the next train with your existing ticket, they may advise you to go to the ticket office at the next station to exchange you ticket for a new one, free of charge.
One may also ask, can you take a later Amtrak train?
As such, you are only allowed to take the train you are ticketed for. To take an earlier or later train, you must change your reservation prior to your scheduled departure, but this is relatively easily done.
Can you change your Amtrak train ticket?
To cancel or change your Amtrak ticket please go to www.Amtrak.com and click on the Modify Trip tab (upper right hand corner) and follow the prompts: Or you can call Amtrak directly at 1 (800) 872-7245. Changes: Amtrak does not charge a ticket change fee, but please note that other fees may apply.
Can I get refund if I miss the train?
Missed Train Confirm ticket You may get refund from railways by filing TDR (ticket deposit receipt) as per extant rules citing reasons for not travelling. Since chart has been prepared you can't cancel the ticket, you can only file TDR within one hour after departure of the train from charting station.