ALCO PA

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The ALCO PA was a family of

There were two models of PAs: the 2,000 horsepower (1,500 kW) PA-1/PB-1, which was built between September 1946 and June 1950, and the 2,250 horsepower (1,680 kW) PA-2/PB-2, which was built between April, 1950 and December, 1953.^{[citation needed]}

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. In early 1944, development started on the new design, and by November 1945 the first engines were beginning to undergo tests. This unusually-short testing sequence was brought about by the decision of ALCO's senior management that the engine and an associated line of road locomotives had to be introduced no later than the end of 1946.

In preparation for this deadline, by January, 1946, the first 16-cylinder 244 engines were being tested, and, while a strike delayed work on the locomotives, the first two PA units were released for road tests in June, 1946 for testing for one month on the Lehigh Valley Railroad. After these first tests were completed, the locomotives returned to the factory for refurbishment and engine replacement.

In September, 1946, the first production units, an A-B-A set of PA1s in

Five PA units and one converted PB unit survive.

• One surviving unit, #600, is from the order of three broad gauge units sold to
  São Paulo as a shell with no prime mover and no side panels. A restoration began in 2001 but has not been completed.^{[citation needed}
  ]
• All four Delaware & Hudson-operated PA-4s have survived, with two being in the United States, and the other two in Mexico.
  • From 1981 to 2000, No.16 and No.18 remained stored in Empalme, Sonora, Mexico. In 2000, the Smithsonian Institution and rail preservationist Doyle McCormack obtained the units and brought them back to the United States.
    • No.16, which was heavily damaged in a derailment while in Mexico, was planned to be cosmetically restored into its original "
      Warbonnet" colors for the Smithsonian Institution. The unit was acquired by the Museum of the American Railroad in 2011 and transported to the museum's new site in Frisco, Texas. Since then, it has been under restoration, with plans to return it to its original Warbonnet appearance and original number of ATSF 59L.^[9]
    • No.18 was owned by Doyle McCormack and has been undergoing restoration since 2002. It has been restored as Nickel Plate Road 190, a recreation of the first locomotive McCormack got to ride.[10] The locomotive was moved to the Oregon Rail Heritage Center, in Portland, Oregon in 2012, where restoration work continued to take place. In March 2023, it was announced that the Genesee Valley Transportation Company would purchase the locomotive, with plans to restore it to operation for excursion use.^[11] It arrived in Scranton, Pennsylvania in May 2023.^[12][13]
  • No.17 and No.19 are preserved at the National Museum of Mexican Railways in
    Daylight colors, but as of February 2010 had been painted over in primer.^{[citation needed}
    ]
• Ex-Denver and Rio Grande PB-1 6002 was converted to a steam generator car in October 1965; it gained Blomberg B trucks in 1980. It was sold to
  Ski Train, and later sold again in 2007 to the Algoma Central Railway
  .

Additional Reading

• Aslaksen, James and McCormack, Doyle. NKP190.com. Retrieved on March 26, 2005.
• Hayden, Bob, ed. (1980). Model Railroader Cyclopedia-Volume 2: Diesel Locomotives. Kalmbach Books.
  ISBN 0-89024-547-9
  .
• Hollingsworth, Brian and Arthur F. Cook (1987). The Great Book of Trains. Portland House, New York, NY.
  ISBN 0-517-64515-7
  .
• Pinkepank, Jerry A. (1973). The Second Diesel Spotter's Guide. Kalmbach Publishing Co., Milwaukee, WI.
  ISBN 0-89024-026-4
  .
• Romano, Andy (1997). PA: Alco's Glamour Girl. Four Ways West Publications.
  ISBN 1-885614-16-0
  .
• Stumpf, Rolf. ALCO World: Paulista RR. Retrieved on March 26, 2005.
• The Santa Fe Diesel Volume One: Dieselization - 1960 by Dr. Cinthia Priest pages 52–56.
• http://utahrails.net/ajkristopans/REPOWEREDLOCOMOTIVES.php see EMD order #8506 dated August 1954 for repowering data on the AT&SF 51 set of PAs.[
  better source needed
  ]

External links

Wikimedia Commons has media related to ALCO PA locomotives.

• America's PA project Archived 2021-05-03 at the Wayback Machine
• DH-17 and DH-19 at the National Museum of Mexican Railroads website.