How did Greece train crash happen? See aerial photos and map of fiery head-on collision.

At least 36 people were killed and 80 injured in a fiery crash when two trains collided head-on near the town of Tempe in northern Greece on Tuesday night.

Cause of the crash, one of the worst in the country's history, is under investigation. Police arrested a 59-year-old stationmaster in the Greek city of Larissa, 20 miles south of the collision.

He was charged with manslaughter by negligence and grievous bodily harm by negligence, the BBC reported. Two others are being questioned.

One of the trains was carrying 342 passengers, many of them students, and 10 staff from Athens to Thessaloniki. The other, a cargo train, was traveling from Thessaloniki to Larissa.

How the trains ended up on the same track is not known.

Kostas Karamanlis, the transport minister of Greece, has resigned, the AP reported.

Where did the trains crash?

The trains collided as the passenger train was coming out of a tunnel. The first four carriages derailed and the first two caught fire. More than 150 firefighters and 40 ambulances are at the site.

Major train disasters in history

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SOURCE Paste BN Network reporting and research; Associated Press