Really Useful Rosie is a magazine story.
Rosie is following Thomas around the Yard, asking if he needs her help. Thomas becomes cross with her. Later, Thomas leaves to collect some sheep at a farm, leaving Rosie alone and sad in the Yard. Rosie soon follows with a truck to deliver, but on the way she sees sheep that have run away after Thomas' sheep vans' door broke open. Rosie has the sheep loaded into her truck, and at the market Thomas finds out what Rosie did and is thankful for her help.