For example by namespace. Just create new folder for #routes config/routes/ and tell #rails to include it:

config.paths["config/routes"] += Dir[Rails.root.join("config/routes/*.rb")]

Then you can create files like this:

# config/routes/admin.rb
Pilot::Application.routes.draw do
  namespace :admin do
    resources :posts
  end
end

How do we usually check the routes in #rails application? We are accustomed to use rake routes command in terminal but there are actually couple tricks. More under the cut

If you have a plural model name you should add underscored name to uncountable array in inflections.rb for create right #routes.

# inflections.rb
ActiveSupport::Inflector.inflections do |inflect|
  inflect.uncountable %w(news)
end

# routes.rb
resources :news

Now #rails won't singular model in members actions.

http://api.rubyonrails.org/classes/ActiveSupport/Inflector/Inflections.html