This is one of my favorites. There were four prototypes and Jeff Sohn painted this one for me. A couple of years later, he painted one for another customer with another road number.
These aren't that rare per se, but finding all six Heritage Units with scale wheels took a lot of effort and searching, and the help of three OGR Forum members. I cheated with the Katy unit and bought a re-release, but the others are the original Proto-2 units.
