I've noticed that the 'standard' (aka horn-hook, aka X2F) coupler tends to push the ends of the coupled cars to opposite rails instead of a straight line. So I'm thinking of Kadee-ing them. Which number should I use?
To bbmiroku : X2F couplers were never "standard" especially for John Bull era locomotives that preceeded the development of "Knuckle" couplers by many decades . Your best bet would be to contact Kadee directly and ask their advise . J2.
Thanks, I will. But by standard, I meant for the train model.
The John Bull probably would have used link-and-pin couplers, like the rest of the Classic Train series.
I've got the exact same problem with my John Bull set. If you could post what you find works for it that'd be amazing. It bothers me even when it's static in my yard.
You could use the Alexander 'link & pin' couplers: https://www.hobbylinc.com/alexander-link-pin-couplers-metal,-1-pair-ho-scale-model-train-parts-6002
They should fit a Kadee #4 coupler box if you can find them, or you can get brass ones from Cal-Scale or Precision Scale.
Len