On Thu, 07 Jul 2005 00:34:14 -0700, Torsten Sadowski  
<moehl at akaflieg.extern.tu-berlin.de> wrote:

> Very neat except that the cart rut thingy is a complete myth.

Or as Snopes puts it:

This is one of those items that -- although wrong in many of its details —  
isn't exactly false in an overall sense and is perhaps more fairly  
labelled as "True, but for trivial and unremarkable reasons."

http://www.snopes.com/history/american/gauge.htm