As I just discussed elsewhere on the site with Ringo, Wagon Train: The Complete Season Four, has been released on DVD here in the US. According to the reviews posted on Amazon, it does include "The Colter Craven Story" as part of the set.
Ringo, I believe this may be what you sure talking about. If I remember right, I believe that "The Colter Craven Story" episode occurred during season four of Wagon Train, so it should be part of this box set.