Sodor Chronicles series 2 Episode 6 The Lost Lady

Taking Place before Thomas's Wonderful Life. This episode we take a trip into the mountains.
Oliver is worried about the amount of ballast loads needed to repair the Island of sodor. A new engine arrives but isnt happy that the process for loading the ballast by the little engines is a long and tedious one.
Can Mike and Harold save the day and whats this about a ghost whistle?