An odd conversion...

[Sumpter250]

And there are the HO GP-9s converted to HOn3. These aren't really free-lance to me, they are cartoon world creations.

I haven't seen any documentation of a GP9 being converted to narrow gauge, but......
<!-- m --><a class="postlink" href="http://en.wikipedia.org/wiki/EMD_DDM45">http://en.wikipedia.org/wiki/EMD_DDM45</a><!-- m --> does document an SD45 conversion to meter gauge, by EMD.
Maybe "cartoon world" is a slight misnomer. :mrgreen:

I forget which magazine it was, that had an "it's not prototype" column. They'd publish photos of "prototypes" that modelers had declared not prototype. The one that sticks in my memory is the turnout on a bridge.