ALLEGHENY <AI> SELLS THREE INDUSTRIAL UNITS Allegheny International Inc said it sold three of its industrial units which served the railroad industry to <Chemetron Railway Products Inc>, a senior management group of Allegheny. Terms of the transaction were not disclosed. Included in the sale were Chemetron Railway Products, True Temper Railway Appliances Inc and Allegheny Axle Co, the company said. The three units include 12 plants throughout the U.S., the company said.