Add this code to categories, but do not include an extra newline before the <noinclude>, and you use the infobox name for sorting:

[[Category:Infobox templates|Passengers]]

Where Passengers may be, for example, used for "Infobox Passengers".

If you would like the infobox to force every page that includes it to be in a certain category, use the <includeonly> tags instead.

Pages in category "Infobox templates"

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