60,000 Pounds of Explosive Chemicals Vanish from Rail Car

Hmmmm…

New York Post:

About 60,000 pounds of an explosive chemical disappeared from a rail car last month as it was being shipped through the western US, according to reports.

Explosives company Dyno Nobel reported the vanishing ammonium nitrate — the main ingredient in Timothy McVeigh’s 1995 bombing in Oklahoma City — to the federal National Response Center on May 10, KQED reported.

Timothy McVeigh’s 1995 bombing in Oklahoma City

The chemical, which can also be used as a fertilizer, was put on a rail car that departed Cheyenne, Wyo., on April 12, headed for California, and the rail car was found empty two weeks later during a stop in the Mojave Desert, the outlet said.

Four separate investigations have since been launched.

What does it mean to “vanish from a rail car”?

Was there a train robbery?

I don’t understand.