Good news!

You are able to resend your ticket to yourself by going on to Amtrak.com and clicking on 'MODIFY TRIP'

Once there, you will enter the confirmation reference number and the email or phone number associated with your reservation.

Your ticket details will populate and then you will see a button on the upper right hand corner that says 'SEND ITINERARY' 

There, you can enter the email you desire the ticket to be sent to.

Safe travels!