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. This set was repowered in August, 1954 with EMD 16-567C engines rated at . 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. Under D&H ownership, they were used by Amtrak for the Adirondack, and later by the Massachusetts Bay Transit Authority, before being sold to the Ferrocarriles Nacionales de México in 1978. They would be operated by the N de M until 1981. 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.<ref>Ingles, J. David, Passenger Diesel Turned Legend, Trains Magazine January, 1997, p.54.</ref> Original owners Foreign sales The PA-2 units sold to the 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. Surviving examples Five PA units and one converted PB unit survive. One surviving unit, #600, is from the order of three broad gauge units sold to Companhia Paulista de Estradas de Ferro in Brazil. It exists at the Companhia Paulista Museum at Jundiai, São Paulo as a shell with no prime mover and no side panels. A restoration began in 2001 but has not been completed. 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