(Source: https://vistanews.ru/society/recreation/134693)

What will you need to get on the train in Russia?

Check here what kind of documents you need to get on the train of Russian Railways.

Without electronic registration:

Ticket  (you can print in the terminal at the train station or get it at the ticket office);
The original of the identity document indicated on the ticket (for example, a passport). If you are traveling with a child, you need an original birth certificate or a notarized copy of it.