PERSONNEL: Three of a Kind

Three famed oldsters in U.S. industry stepped aside last week for younger men: Big Bill Jeffers, whose strong back and sharp mind have run the Union Pacific Railroad for eight years, will retire from the presidency Feb. 1 at the age of 70, the road's age limit. He will continue as a director, but plans to take things easy in his new home, complete with swimming pool, in Los Angeles. Into his big shoes will step Executive Vice President George F. Ashby, 60, who went to work for U.P. in the engineering department 34 years ago. Like...