emberjs/ember-rails — pull request #71 by joliss (2012-06-27 10:41:10+00:00)
Title: Require rails in ember_rails

This is not normally necessary in Rails itself, but I've needed to
interactively pry into ember-rails.

"require 'rails'" seems to be the correct way to require railties:
https://github.com/rails/rails/tree/master/railties/lib