The Space Shuttle and the Horse’s Rear End (2000)

The Space Shuttle and the Horse’s Rear End

Say friend, did you know that the US Standard railroad gauge (distance between the rails) is 4 feet, 8 1/2 inches. The United States standard railroad gauge of 4 feet, 8 1/2 inches derives from the original specification for an Imperial Roman army war chariot. Well, there’s an interesting extension of the story about railroad gauge and horses’ behinds.

Source: www.astrodigital.org