Located on over 40 acres, the National Museum of Transportation is approximately 16 miles southwest of downtown St. Louis, on a site which includes one of the two first man-made railroad tunnels west of the Mississippi River. The Museum site features more than four miles of switching and exhibition track, houses a nationally acclaimed research library of transportation-related memorabilia and documents, and contains over 70 locomotives, half of them "one-of-a-kind" or "sole survivors" of their type. Our collections of automobiles, buses, streetcars, aircraft, horse-drawn vehicles, and riverboat materials are constantly expanding to reflect the ever-changing nature of transportation. Sustainable gardens highlight the role of transportation in nature.