First of all I think you have confused the different HO/OO narrow gauge modeling scales or gauges.
HOn3 refers to HO scale 3 foot gauge.
HOn30 or OO9 are the scale and gauges used for our Thomas narrow gauge models.
HOn30 refers to HO scale (1/87) with a gauge of 30 inches, also sometimes called HOn2 1/2.
OO9 refers to OO scale (1/76) with a gauge of 9mm or N gauge track.
This may be why you are having difficulty finding what you are looking for regarding Thomas narrow gauge equipment which will not run on HOn3 track.
I hope this helps,
Grandpuff
HOn3 refers to HO scale 3 foot gauge.
HOn30 or OO9 are the scale and gauges used for our Thomas narrow gauge models.
HOn30 refers to HO scale (1/87) with a gauge of 30 inches, also sometimes called HOn2 1/2.
OO9 refers to OO scale (1/76) with a gauge of 9mm or N gauge track.
This may be why you are having difficulty finding what you are looking for regarding Thomas narrow gauge equipment which will not run on HOn3 track.
I hope this helps,
Grandpuff