The average fare for Russian railways is about 800 RUB to 2000 RUB. Sapsan is the fastest train to travel in between the cities of Moscow , St. Petersburg and Nizhny Novgorod. The average fare for its business class ticket is about 3500 RUB to 7000 RUB. And its economy class ticket is about 2000 RUB to 3500 RUB. You can reserve your online train tickets here.