According to the company that owns the cisterns of the cargo train which derailed on Saturday morning in Hitrino, there are three main versions of the tragic accident- speeding, technical failure of some of the wagons and technical failure of the railway infrastructure. The first engine-driver is one of our top engine-drivers, the owner of the company Stanko Stankov said on Monday. Our company insists that the reason for that heavy accident should be found, Mr Stankov specified. Stanko Stankov also noted that he sent an explicit request to the district prosecutor asking him to leave the cisterns on the site of the blast, because the company expects German experts to arrive in Hitrino and make their own investigation.