TEHRAN: The head of Iranian Railways resigned on Saturday after three of his employees were arrested over a collision between two trains that left at least 44 people dead. Mohsen Poor-Seyed Aghaie, a deputy minister in the transport ministry and head of the state-owned railway company, appeared on state television late Saturday and announced his resignation “as a social responsibility and out of sympathy for the survivors of this accident”. Two trains collided and one caught fire in the northern province of Semnan on Friday, killing 44 people and injuring dozens more, in one of the country’s worst ever rail disasters.