Rich,
Sorry, but I disagree. Not all O gauge trains are true O scale-think 027 and traditional size. Besides, if you disagree, I may sue you . Now be sure to hook up two or more engines in a LASH UP on our layout. The term lash up comes as a tribute to Tony LASH since he had so many engines and garbage trucks.
I think it is fair to say that both of us are correct.
Erol