Happy Hook was old and had not been repaired for a long time; as a result, Dart complained about the crane frequently. Kevin was then brought to the Dieselworks to do the jobs that Happy Hook could not, and enjoyed playing with it. When the Dieselworks was rebuilt, Happy Hook was restored. When it was Christmas time, Diesel 10 decorated Happy Hook with red ribbons, Christmas lights and mistletoe. He later removed these decorations and gave them back to the Steam Team.