Sapsan is a Russian gauge high speed electric express train.

Moscow - Saint Petersburg route:
- Moscow(Leningradsky railway terminal)
- Tver
- Vyshny Volochyok
- Bologoye
- Uglovka
- Okulovka
- Chudovo
- Saint Petersburg(Moskovsky railway terminal)

The trains started regular service on the Moscow – Saint Petersburg Railway in December 200 at a maximum speed of 250 km/h (155 mph) (a new build High-Speed Line would allow for speeds of up to 350 km/h or 217 mph).

Since entering service in December 2009, it has been Russian Railways' only profitable passenger service, with an occupancy rate of 84.5%. According to the timetable valid from 30 October 2011, the direct train from Moscow to St Petersburg without intermediate stops needs 3:40, the train from Moscow to Nizhniy Novgorod 3:55 hours.

Introduction of Sapsan initially provoked cancelling of affordable daytime trains between Moscow and St.Petersburg. Since the end of 2012, Moscow – St.Petersburg daytime trains other than Sapsan were running again.

There were a series of stone throwing attacks against Sapsan trains. Possible reasons including cancelling of commuter trains, disruption of local transportation in rural areas, and accidents because of poor safety for pedestrians have been suggested. New bridge crossings were built, platforms along the railway were reconstructed and additional track was completed in 2015. New Lastochka commuter trains were introduced on the Moscow-Tver and St.Petersburg-Bologoye routes. Local trains in the rural areas were saved.