Historic trains are significant locomotives and railcars that played a crucial role in the development of transportation. They include famous models like the Locomotive No. 999, which was known for its speed, and the Union Pacific Big Boy, one of the largest steam locomotives ever built. These trains helped connect cities and facilitate trade, shaping economies and cultures. Many historic trains are preserved in museums or used for scenic rides, allowing people to experience the charm of early rail travel. Examples include the Orient Express, which became synonymous with luxury travel, and the Santa Fe Super Chief, known for its iconic design and service.