The incident took place in the south of Russia’s second city. Two trains coming from opposite directions suffered what the city emergency services called a “grazing collision” that was still powerful enough to send two giant locomotives and a freight car off the rails, RT reported.

A video purportedly filmed in the aftermath of the collision shows one bulk two-section locomotive folded up almost like a jackknife, while another one is seen bumping up against the twisted rail tracks.

All passenger trains scheduled to run through the area were re-routed to a backup route. The exact cause of the collision is still unknown.