Starting from October 1, 2019, nationals of 53 foreign States may be granted an e-visa to enter the Russian Federation through air, naval, automobile, and pedestrian checkpoints located in the territory of Saint Petersburg and the Leningrad region.

PLEASE NOTE: Entry and exit on an e-visa by means of rail transport is currently unavailable.

List of the countries:
http://electronic-visa.kdmid.ru/spb_country_en.html