Use the Amtrak website to determine your new date, route and cost. The reservations tab will allow you to find the schedule and cost. Do not make a new reservation.
Call Amtrak reservations at (800) USA-RAIL or (800) 872-7245. Say "agent" or dial "0" for a live agent. Tell the agent that you want to change your reservation. You will need your reservation number and the original date of travel.
Change sleeping car accommodations at least seven days in advance. First-class tickets should be changed at least one hour in advance.
If your new ticket is more expensive, make arrangements to pay the difference. Amtrak accepts American Express, Diners Club, Discover, MasterCard, VISA and Universal Air Travel Plan (UATP).
Write down the reservation number and date of your changed ticket.