The new president of the Chesapeake and Ohio and Baltimore and Ohio railroads is John T. Collinson, former executive vice president of operations for Chessie System Inc., parent company for the two rail lines. In addition, Howard E. Simpson was elected chairman emeritus of the Baltimore and Ohio Railroad.

Collinson joined the B&O in 1946 as an engineering assistant. After holding various positions in the engineering department, he became chief engineer in 1964. Two years later, he was promoted to chief enginer-maintenance for both the C&O and the B&O railroads. In 1971 Collinson became general manager-chief engineer for Chessie and was promoted to vice president for operations and maintenance in 1973.

During his 66-year career with the railroad, Simpson has served as president, chairman and chief executive officer of the B&O. He has been a director of the B&O since 1961.

Henry E. Catto Jr., former White House chief of protocol and U.S. ambassador to El Salvador, has been named international affairs consultant to the Washington office of Hill and Knowlton Inc.

Catto served as protocol chief during the Ford administration. Before that, he was deputy U.S. representative to the Organisation of American States and U.S. ambassador to El Salvador. After Cato left the White House in 1974, he was named permanent representative to the European office of the United Nations in Geneva.

Milton L. Drewer Jr., president and chief executive officer of First American Bank of Virginia, was elected to the board of directors of Virginia Electric and Power Co.