Once the second-largest steam locomotive builder in the U.S., American Locomotive Company (Alco) produced 75,000 locomotives, among them such famous examples as

Introduced in the 1930s, efficient and adaptable diesel locomotives had all but displaced steam locomotives by 1960. This colorful photographic history examines

Learn the history, spotting features, characteristics, and operation of diesel locomotives, plus how to determine appropriate eras, and details and features.