RE: Bachmman and ModelPower couplers.
Yes. Unlike in large scale, all of the common HO (and thus On30) knuckle couplers should work reasonably reliably together. Mixing the scale and standard sizes (Kadee #58 and #5, respectively) can sometimes be a slight challenge, especially when coupling in curves or trying to manually uncouple, but event hat I would call gould enough to be reliable.
Kenneth Rickman Salisbury, NC
"Never attribute to malice that which is adequately explained by stupidity." - Robert J. Hanlon