Ha Ralph, since HO is 1:87, and a mile is 5280' you can divid that by 87 and get 60.69' to a HO scale mile. That known you can divid the feet of track by 60.69 to find the scale miles of track. As for speed, if your train covers the 60.69' in 1 minite ,it would be doing 60 scale mph. If your...