Definitely not O, HO stands for 'half O', and OO is/was pretty rare outside of t... | Hacker News

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		jacquesm on Feb 28, 2021 \| parent \| context \| favorite \| on: Hunting two PDP-1 photos (which are not what they ... Definitely not O, HO stands for 'half O', and OO is/was pretty rare outside of the UK, I'd bet on HO.

masswerk on Feb 28, 2021 [–]

Yes, not OO. There were probably no such US coaches available in OO.

jacquesm on Feb 28, 2021 | [–]

And O would be way larger:

http://wgh.trains.com/-/media/Images/How%20To/Articles/ABCs%...

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