description Alco PA Overview
The Alco PA is a family of streamlined diesel-electric passenger locomotives constructed by the American Locomotive Company between 1946 and 1953. Distinguished by its aggressive, sweeping exterior styling, the A-unit variants featured a 2,000-horsepower sixteen-cylinder prime mover. Railroads such as the Atchison, Topeka and Santa Fe and the New York Central utilized these locomotives to pull their premier passenger trains. The design is frequently cited by rail enthusiasts as an aesthetic high point of mid-twentieth-century locomotive engineering.
insights Ranking position
Alco PA ranks #78 of 397 in the Locomotive ranking, behind Pennsylvania Railroad K4s Pacific, ahead of SR Schools Class (V).
help Alco PA FAQ
What engine did the Alco PA locomotive use?
The Alco PA was powered by a 16-cylinder version of the American Locomotive Company's 244 prime mover. This turbocharged diesel engine produced 2,000 horsepower for the A-unit variants. Despite its impressive power and sound, the 244 engine was plagued with reliability issues throughout its service life.
When was the Alco PA locomotive built?
The Alco PA (and its cabless B-unit companion, the PB) was constructed by the American Locomotive Company between 1946 and 1953. It was designed specifically to compete with Electro-Motive Division's (EMD) highly successful E-unit passenger locomotives. Its aggressive, sweeping exterior styling was created by renowned industrial designer Ray Patten.
Which railroads famously used the Alco PA?
The Alco PA was famously operated by the Atchison, Topeka and Santa Fe Railway (Santa Fe), who used the locomotives on their premier passenger trains like the *Super Chief*. Other notable railroads included the Delaware and Hudson (D&H) and the New Haven Railroad. Many railfans consider the Santa Fe "Warbonnet" paint scheme on the PA to be one of the most beautiful locomotive designs ever.
Are there any running Alco PA locomotives left today?
Yes, there are a few surviving Alco PA locomotives, though they are incredibly rare. The most famous is Santa Fe No. 59, which was heavily restored by the Napa Valley Wine Train in California. Additionally, two former D&H PA units were acquired by the Durango & Silverton Narrow Gauge Railroad and later preserved.
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