DULLES, Va., Feb. 8 /PRNewswire/ -- Orbital Sciences Corporation (NYSE: ORB) announced today that its Transportation Management Systems (TMS) Division has successfully implemented the first part of a state-of-the-art transit management system in Singapore. Under a contract awarded by the privately-run Singapore Bus Services (SBS) Ltd. in early 2000, Orbital TMS is developing the Automatic Vehicle Management System (AVMS) to monitor and track a fleet of 2,700 transit vehicles. The AVMS includes six subsystems, the first of which -- the Autonomous Bus Service (ABS) -- is now operating on in- service buses in Singapore. The remaining subsystems will be phased into SBS's operations over the next several years.

The ABS subsystem introduces some of the key features of vehicle tracking technology in an operational environment. It displays real-time schedule adherence information, helping to educate drivers in the use of the onboard console to know whether they are running ahead of or behind a preplanned schedule. The ABS subsystem also collects performance data that SBS can review to determine whether a bus route schedule needs to be revised to improve on-time performance and enhance customer satisfaction.

Mr. Cheng Lay Tin, Vice President of Corporate Communications for SBS, said, "We are very pleased and encouraged by the progress and dedication shown by the Orbital TMS team in support of the AVMS program."

Speaking for Orbital, Mr. David L. Mathisen, Vice President and General Manager of the TMS Division, said, "Our success in meeting an aggressive schedule to implement the first phase of the SBS program indicates that we are off to a very encouraging start on this important and high-profile vehicle management program with SBS. The outstanding cooperation between Orbital's team and SBS went a long way to ensure the on-time delivery of this first phase."

The Global Positioning System (GPS)-based AVMS is designed to enhance bus service management, schedule adherence and asset utilization. Once complete, SBS expects that it will make a significant impact in Singapore, a country where public transportation is widely used. With its large scale implementation in the high-tech Singapore market, Orbital TMS intends to use the SBS program as a model to pursue other opportunities to help manage public transit systems across the globe.

About Orbital TMS:

Orbital TMS is the leading supplier of satellite-based automatic vehicle location (AVL) systems in the United States for the expanding public intelligent transportation systems market. These AVL systems help transportation authorities better manage mass transit bus and rail systems, as well as fleets of road maintenance and service vehicles. They feature fully integrated real-time information, two-way mobile communications and GPS satellite-based vehicle positioning. Orbital's AVL systems are used by 55 transit, utility and state agency customers in the United States, with units installed or scheduled to be installed on approximately 22,700 vehicles. Since 1995, Orbital TMS has received over $250 million in new orders and today generates annual revenues of approximately $60 million. Orbital TMS employs over 200 people at its new facility in Columbia, Maryland.

More information about Orbital TMS can be found at http://www.orbital.com/tms .

About Orbital:

Orbital is one of the largest space technology and satellite services companies in the world, with 1999 total enterprise revenues (including revenues from unconsolidated affiliates) of approximately $915 million. The company, headquartered in Dulles, Virginia, employs about 4,500 people at major facilities in the United States, Canada and several overseas locations.

Orbital is one of the world's leading manufacturers of low-cost space systems, including satellites, launch vehicles, electronics and sensors, satellite ground systems and related digital infrastructure. Its Magellan subsidiary is a pioneer in satellite-based navigation and communications products for consumer and industrial markets. Through its ORBCOMM and ORBIMAGE affiliates and ORBNAV subsidiary, Orbital is also a major operator of satellite-based networks that provide data communications, high-resolution imagery and automotive information services to customers all around the world.

More information about Orbital can be found at http://www.orbital.com . SOURCE Orbital Sciences Corporation

CONTACT: Media: Barron Beneski, 703-406-5000, or beneski.barron@orbital.com; or Investors: Timothy Perrott, 703-406-5997, or perrott.tim@orbital.com, both of Orbital Sciences Corporation/