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
The Union Pacific Railroad "Big Boys" are often credited as having been the largest steam locomotives in the world. Although these 25 steam giants last operated
Union Pacific's Big Boys: The complete story from history to restoration covers the who, what, why, and when of the 25 popular 4-8-8-4 steam locomotives. This b