WASHINGTON, D.C. — Following a detailed “How-To” derail trains in an Al Qaeda magazine, Transportation Safety Administration officials have sent an alert to mass transit, passenger, and freight train operators concerning "steps that they can take to protect their systems from being targeted by violent extremists," WLS-TV reports.

The terrorist groups’ propaganda magazine not only details how to derail trains, but also includes a list of dozens of “vulnerable” train routes in the U.S. as potential targets that could result in mass casualties.

According to the report, TSA’s message to transit officials was that Al Qaeda’s how-to is an important reminder that mass transit, passenger rail, and freight rail operations are a potential target for terrorist activity. For the full story, click here.