The American Locomotive Company introduced the PA1 locomotive in 1946 to compete with EMD's successful "E" Series passenger diesels. The first PA1 celebrated Alco's 75,000th loco to roll out of the erecting shop. This attractive 2000HP loco was their high-speed passenger diesel. Having more horsepower than their leading competitor, Alco felt that they had a fleet-ready competitive product. PA1's were sleek, stylish, powerful, and were very well suited for America's passenger and fast freight trains. Additionally, their 65'8" bodies became excellent billboard advertising for the railroads that they served with pride.