It is reported by the Russian Telegram channel.
A lineman noticed that the tracks had been damaged. He informed his superiors about this, and they called the security forces.
More than ten different policemen and experts gathered to inspect the damaged rails.
The investigators estimate that an explosive device weighing nearly 200 grams in TNT equivalent was put under the rails, and it was blown up.
Police interviewed the residents of the surrounding villages but none of the locals had noticed anything suspicious.