Thomas & Friends (1984)

S13E6 The Early Bird

With Percy undergoing repairs at the Sodor Steamworks, the Fat Controller assigns Thomas to handle the mail delivery. Thrilled by the opportunity, Thomas disregards Gordon's suggestion to consult Percy for guidance. Eager to impress, Thomas takes matters into his own hands but makes a significant error by whistling loudly, which disrupts the peaceful slumber of his fellow engines.