Why not use the tag 'gauge' (as well as the tag 'railway'), which enables you 
to be more explicit than 'minimum'?  It has getting-on-for 2 million uses. 
Presumably 'minimum' will vary across the globe anyway.
(Sorry if this doesn't reply to the thread. It's my first post. If it doesn't 
I'll have to investigate further how I should be doing it.)
Rob


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