@jhz563 I'll let you know when the boxed set gets here LOL !
They are marketed as "Standard Gauge " train sets , and seem to have a collaborative history behind the various versions with attributes to Sakai Dakin and even Alps thrown around as manufacturers .
The Sakai collectors guys are happy to call them Sakai tho ...they are def 0-ish in scale tho
All the sets came with various 2-rail track .. and I could be wrong but I "think" it is nominally smaller than O ... I think @Steve "Papa" Eastman
might be able to chime in ?
The full set is in my post a page or so back ..
They take D size batteries tho .. so def of a good size !