41.   Furthermore, the engineer of a train going in the opposite direction saw the workers on the track but did not notify the control center or the oncoming train.

42.   Ground-communication links between various air-traffic control centers in Africa are unreliable, the report said.

43.   He and a technician had hopped into a car and headed back to the RTS control center in Kosutnjak, on the outskirts of Belgrade.

44.   Hit a roadside assistance button and the phone will contact a control center, whose operator will ask what help you need.

45.   If your child ingests a toxin, call your local poison control center before doing anything else.

46.   In early October, when American epidemiologists linked the spread of anthrax to the postal system, Kournikakis said he sent the report to the disease control centers.

47.   In an unrelated incident, a main computer at the Indianapolis air traffic control center crashed Tuesday, causing flight delays across the Midwest.

48.   In recognition of that new role for the agency, President Bush last week became the first U.S. president to visit the disease control centers while in office.

49.   In March, Nice said the Austrian Air Traffic Control Authority, Austro Control GmbH, bought its system for the Vienna air traffic control center.

50.   In Quito, the three negotiating companies had covered the walls of the main room of their control center with large photographs of the hostages.