When I create a random single .rb or .erb file, the filetype is recognized as ruby/eruby (which is set from ~/.vim/bundle/vim-ruby/ftdetect/ruby.vim), syntax, colors, highlighting, omnicompletion all function, but the modeline is not being set.

The following commands return these values:

:verbose set modeline? #last set from ~/.vimrc
:verbose set modelines? #returns modelines=5
:verbose set sw sts ts expandtab? #shiftwidth=8 softtabstop=0 tabstop=8 noexpandtab

I also have the vim-rails bundle installed in ~/.vim/bundle. The modeline works correctly for .rb and .erb files that are part of a rails project. Filetypes are determined and set by vim-ruby/ftdetect/ruby.vim, but

:verbose set sw sts ts expandtab? #shiftwidth=2 softtabstop=2 tabstop=8 expandtab

With all of these values being set from vim-rails/autoload/rails.vim

Any idea why the ruby.vim modeline is not being applied?