If you purchased an electronic ticket, you will receive an email with your ticket in PDF format. You should print it and take it with you on a trip.
Documents which you should show while boarding if the electronic registration was passed:
Documents which you should show while boarding if electronic registration wasn't passed:
Note: If you purchased a paper ticket, you will have to collect an original copy of the ticket that we've purchased for you before boarding the train.
According to the Russian Railways terms, the original identification document is required to board the train. Any copy cannot be accepted instead of the original document.