At least 55 people were injured in a serious train accident in Russia after the Moscow to Chelyabinsk night train derailed and seven double-decker carriages overturned.

No one was killed in the accident, according to state-run Russian news agency TASS, citing the authorities.

There were 415 passengers on board and at least 55 suffered minor or moderate injuries, regional governor Alexei Russkich said. Seventeen people are being treated in hospital, he said. Earlier reports put the number injured at 35.

Some of the passengers managed to climb out of the overturned carriages, as could be seen in a video on Telegram channel Baza.

The accident occurred near the village of Bryandino in the Ulyanovsk region, just under 800 kilometres east of Moscow, half way to Chelyabinsk in Western Siberia.

In seeking the cause of the incident, Russia’s State Investigative Committee pointed to the worn-out track bed, Interfax news agency reported.