The ALCO PA was a family of A1A-A1A diesel locomotives built to haul passenger trains. The locomotives were built in Schenectady, New York, in the United States, by a partnership of the American Locomotive Company (ALCO) and General Electric (GE) between June, 1946 and December, 1953. Designed by General Electric's Ray Patten (along with their ALCO FA cousins), they were of a cab unit design; both cab-equipped lead A unit PA and cabless booster B unit PB models were built. While externally the PB models were slightly shorter than the PA model,[1] they shared many of the same characteristics, both aesthetically and mechanically. However, they were not as reliable as EMD E-units.[2]
ALCO's designation of P indicates that they were geared for higher speeds and passenger use, whereas the F designation marks these locomotives as being geared primarily for freight use. However, beyond this, their design was largely similar - aside from the PA/PB's both being larger A1A-A1A types with an even more striking nose - and many railroads used PA and FA locomotives for both freight and passenger service.
Although the majority of the PAs and PBs have been scrapped, six examples have survived. Five PAs are now preserved in railroad museums, while a converted PB still remains in service as a power car.
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 Santa Fe colors, numbered #51L, 51A and 51B, were released from the factory and sent to New York's Waldorf-Astoria Hotel, which had a private railroad siding, for exhibition before being launched into road service.[3] This set was repowered in August, 1954 with EMD 16-567C engines rated at 1,750 hp (1,300 kW). This EMD repowering of the PAs was economically unfeasible, and the remaining Santa Fe PAs retained their 244 engines.
Four PA-1s previously operated by the Santa Fe were sold to Delaware and Hudson Railway in 1967. In 1974-1975, they were rebuilt for the D&H as PA-4s by Morrison Knudsen and equipped with ALCO's 251 V-12 engines.[4] Under D&H ownership, they were used by Amtrak for the Adirondack.[5] (Amtrak itself only purchased EMD E- and F-units from the railroads whose service it replaced for its diesel roster, and never owned any PAs.[5][6]) They were used by the Massachusetts Bay Transit Authority in the late 1970s, then by Ferrocarriles Nacionales de México in 1978–81.
Fans deemed the PA one of the most beautiful diesels and an "Honorary Steam Locomotive", as noted by Professor George W. Hilton in a book review in September, 1968 Trains Magazine. When accelerating, until the turbocharger came up to speed, thick clouds of black smoke would pour from the exhaust stacks due to turbo lag. Photographing a moving PA while smoking became a prime objective of railfans.[7][8]
The PA-2 units sold to the 1,600 mm (5 ft 3 in) broad gauge Companhia Paulista de Estradas de Ferro of São Paulo State in Brazil were equipped with a bar pilot and solid horizontal steel pilot beam. One of these locomotives survives.
Five PA units and one converted PB unit survive.
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