"Fans from 155 countries have booked 85 percent of the seats in the free trains to the matches of the 2018 World Cup group stage and 60 percent - for the knockout stage. The top five countries after Russia are Colombia, Argentina, Mexico, the United States and China," Polyakov said.

He added that 396 out of the 734 free trains were fully booked with St. Petersburg, Sochi, Kazan, Nizhny Novgorod and Samara being the most popular destinations.

Fans must purchase match tickets and have a valid Fan ID in order to be able to reserve a seat free of charge.

Russia will host its first World Cup from June 14 to July 15. The fixtures will be played at 12 stadiums across 11 cities.