When I tried to generate the new route as so:
iron g:route '/users/:_id
The resulting route in routes.js looks like this:
Router.route('/users/id', { name: 'usersId', controller: 'IdController', where: 'client' });
I expected
Router.route('/users/:_id', { name: 'usersId', controller: 'IdController', where: 'client' });