Seen just after arrival at Seattle's Pier 42 from LaGrange, Illinois, are two new Alaska Railroad 1500 horsepower 115-ton diesel locomotives en route to Seward with four other similar locomotives yet due in Seattle.  These engines are scheduled to sail for Alaska this week on the motorship Gadsden which the Alaska Steamship Company has chartered especially for this heavy-lift movement.  The Gadsden is equipped with extra heavy-gear and has been employed previously to move heavy rolling stock.