The AT&SF used its 4-8-4s for passenger service. Since its main line stretching over 2200 miles (Chicago to California), the AT&SF had a real need for excellent motive power.

Convinced that the Northerns could handle its needs, AT&SF ordered 11 more in 1938 with 80" drivers (known as Class 3765 and included road numbers 3765 through 3775) with another 10 ordered in 1941 (Class 3776, including road numbers 3776 through 3785)

The last group of 30 were built in 1943 and 1944. Wartime shortages of material resulted in ordinary metals being used for their construction. As a result, they were the heaviest Northerns ever built. They out weighed their nearest rivals by over 2000 pounds. This group was known as Class 2900 and included road numbers 2900 through 2929. 
(from Steamlocomotive.com)

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