TEHRAN – The collision of two trains at Tehran’s urban subway on Tuesday has been caused by human error, a city councilor has announced.

A technical failure in automatic train protection (ATP) system caused the incident and the train conductor turned the system off without any arrangement, ISNA quoted Eqbal Shakeri as saying.

About 50 passengers were injured during the incident, which occurred when a train struck another, which stopped at the station. 

ATP ensures safe operations in the event of driver's failure. It monitors train location, traffic condition and gives signal to follow certain speeds.

The Tehran metro has five active lines with nearly 200 kilometers of track carrying hundreds of thousands of passengers per day.

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