So, On30 is O scale trains on HO gauge track... Now, with O scale we all know how there are several different sizes... With On30 though, is everything (like Bachmann Spectrum) 1/48 scale?
I think ON30 is all the same size.
I found this a copy and paste.
On30 uses the American O scale of 1/4" to the foot, (ratio 1:48) to operate trains on HO gauge (16.5 mm/0.650 in) track. The 30 indicates the scale/gauge combination is used to model 2 ft 6 in (762 mm) (30") narrow gauge prototypes, although it is often used to model 2 ft (610 mm) and 3 ft (914 mm) gauge prototypes as well. This scale/gauge combination is sometimes referred to as On2½.
Shaygetz (spelled wrong?) will know for sure.