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(CSX Transportation issued the following news release on August 20.)

JACKSONVILLE, Fla. — CSX Transportation’s (CSXT) information technology systems experienced significant slowdowns early today after a computer virus infected the network. The cause was believed to be a worm virus similar to those that have infected the systems of other major companies and agencies in recent days.

The infection resulted in a slowdown of major applications, including dispatching and signal systems. As a result, passenger and freight train traffic was halted immediately, including the morning commuter train service in the metropolitan Washington, D.C., area. Contrary to initial reports, the signal system for train operations was not the source of the problem. Rather, the virus disrupted the CSXT telecommunications network upon which certain systems rely, including signal, dispatching and other operating systems.

CSXT’s technology and operating teams immediately began aggressive and comprehensive efforts to restore the computer system and service to rail passengers and freight customers. Many key systems had been restored as of midday, allowing for resumption of substantial operations as the company works toward full system capability. Passengers with questions about service and schedules for today should contact VRE, MARC or Amtrak directly.

Consistent with standard procedures, CSXT notified VRE, MARC and Amtrak of the problem and began contacting state and federal agencies to inform them of the situation and expected impact. CSXT continues to give first priority to passenger train operations and preparing for today’s evening rush hour.

CSXT has confronted increasingly sophisticated computer viruses, like ones that have penetrated some of the most secure sites in the country in recent days. The company will continue to work to counter the effects of these viruses and to prevent intrusion. CSXT shares the frustrations of the affected passengers and, as it moves forward, will remain firmly committed to providing the level of service that they require.

CSX Corporation, based in Jacksonville, Fla., owns the largest rail network in the eastern United States. CSXT and its 34,000 employees provide rail transportation services over a 23,000 route-mile network in 23 states, the District of Columbia and two Canadian provinces. CSX Corporation also provides intermodal and global container terminal operations through other subsidiaries.