I guess it would be accepted with 'narrow', 'standard' and 'broad' as values if you don't know the exact measurement. --Gorm 14:23, 15 September 2012 (BST)
- Yes, of course! It better to have a vague gauge=broad/narrow tag than no gauge tag at all.--Geogast 15:13, 15 September 2012 (BST)