DIY Dolly - Need Confirmation on my specs
 

I'm having a dolly built and I would love for it to fit on industry-standard dolly track. Based on my internet expeditions, it seems that most dolly track specifications look something like this:

1 1/2" outside diameter for the track pipe (the piping on which the dolly physically rolls)
24 1/2" center-to-center (the width of the track)

Is this indeed the 'industry-standard'?

Renting some dolly track would immediately answer my question, but I don't have that luxury which is why I've posted here.

It seems I'm not the only one in the dark about industry-standard dimensions for dolly track.