The bulk update request #11980 is pending approval.

create alias rails (20) -> rail_(disambiguation) (0)
create alias rail (153) -> rail_(disambiguation) (0)
change category rail_(disambiguation) (0) -> invalid

Reason: As per topic #58911
Given that both tags is currently used for handrails, railing, train tracks/rails, and a bunch of other thing.
Also it's a species and a name.
Both tags should be aliased to rail_(disambiguation) instead.