Zachariah,
I did a search on "driver link" and got these hits. Not all results are useful.
https://ogrforum.ogaugerr.com/...agination.sort=SCORE
But here are some causes:
- Loose traction tires,
- Sprung driver springs too ???,
- Not all drives contacting the rails; possible twisted frame,
- Loose tires on drivers,
- To much weight on leading and trailing trucks, and
- ???
Jan