[aquakiwi]

I have a Bachman Jupiter given to me and its quite tiny so I'm wondering if it is HO, can any member help?

 

[wvgca]

could be HO, could also be N scale ....
whats the distance across the wheels ?? [not including the tread]

 

[Dennis461]

As WCVGA wrote,
What is measurement "B"

Link to NMRA standards page
https://www.nmra.org/beginner/wheels-metal-or-plastic

 

[mopac]

I have one in HO. They don't run good. Motor in tender. I am going to use mine as a
static display in a park.

 

[Old_Hobo]

Even if it's HO, it will be noticeably small compared to other HO locomotives.....

 

[wvgca]

Even if it's HO, it will be noticeably small compared to other HO locomotives.....

true, it's a very small loco ....
the 'K' distance in HO is 0.603 inches, and in N it's 0.321 inches .. not that hard to tell what scale it is ..

 

[aquakiwi]

Thanks guys, it certainly runs ok on HO track so i guess its HO.