FIFA said the state railway monopoly would be a third-tier regional sponsor of the event, joining fellow Russian companies Alfa-Bank and Rostelecom.
Russian Railways is offering 880,000 free journeys to match ticket holders travelling between venue cities and that half of those had already been booked, FIFA said in a statement.
It added that an additional 728 long-distance trains on 31 routes had been scheduled during the course of the tournament.
(Writing by Brian Homewood in Bern; Editing by Toby Davis)
