I 3D printed my own out of TPU for my 3rd Rail High Iron K4. 3rd Rail uses rather unique dimensions and some tires are just not available anymore so I decided to roll my own after becoming aware of TPU filament:
https://ogrforum.ogaugerr.com/...raction-tires?page=1
The set I printed up for my K4 are still in service. I still haven't tried them in a snowstorm (that thread gets real goofy toward the end if you make it that far, sorry).