[Talk-GB] Miniature railway or minimum gauge?

[Martin Wynne]

I refer to the Rhiw Valley Light Railway:

  https://www.openstreetmap.org/#map=19/52.61639/-3.26766

  https://www.geograph.org.uk/photo/5712937

This is a private 15" gauge railway which holds regular open days for 
the public:

  http://rvlr.co.uk/

It is currently tagged as railway=miniature. But the OSM wiki says 15" 
gauge railways should be called instead "minimum-gauge railways", 
although there doesn't seem to be any such tag available:

  https://wiki.openstreetmap.org/wiki/Tag:railway=miniature

Wikipedia suggests that a "miniature railway" is one using rideable 
*models* of real railways, which is not the case for the RVLR:

  https://en.wikipedia.org/wiki/Minimum-gauge_railway

Should I change the tag to railway=minimum_gauge, bearing in mind this 
is not a common usage in the UK?

Thanks.

Martin.