Ammonium nitrate
Approximately 60,000 pounds of ammonium nitrate pellets are believed to have fallen onto the tracks in small quantities throughout the two-week trip.
More than 130 people died in an explosion in the Lebanese port city.
The explosion at Beirut's port killed at least 100 people and wounded thousands.
One hundred people were killed and thousands more were injured in the explosion that ripped through the city, leaving swaths of residents homeless.
