Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. ALCO PA refers to a family of A1A-A1A diesel locomotives built to haul passenger trains built in Schenectady, New York in the United States by a partnership of the American Locomotive Company and General Electric between June, 1946 and December, 1953. They were of a cab unit design, and both cab-equipped lead A unit PA and cabless booster B unit PB models were built. The PAs, as well as their cousins, the ALCO FAs, were born as a result of Alco's development of a new diesel engine design, the Model 244.