Iron Harry (along with his twin brother Iron Bert) are 2 gruff diesel twins who work for the barrow Ironworks at the smelters. Harry is one of the teirtary antagonists of the show.
Iron Harry (along with his brother Iron Bert) is a diesel engine that works down in the scrap yards and smelters sheds. As with most diesel engines, Harry feels that diesel engines are superior to steam engines and enjoys breaking them down when he gets the chance. 
'Arry and Bert were devious from the start. In Day of the Diesels, they took Kevin and Percy to the so called 'Caring Place' which was actually the garbage chute whilst Thomas lead Diesel 10 and the rest of the diesels to the Sodor Steamworks but Diesel 10 told Thomas that they were taking over the Steamworks whilst Kevin and Percy were held prisoners at the Dieselworks Thomas knew that he had to rescue his best friend but he couldn't do anything about it Harry and Bert were blocking his way. The pair then decided that they would shove Dart into a fewness as for being a scaredy engine but Belle came and taught the pair a lesson. Harry and Bert are devious Diesel twins.
Harry and Bert are unquestionably devious and scheming. Although at first they had a heartened dislike for steam engines, they appear to have grown accustomed to their smoke-puffing companions.
Harry and Bert are BR Class 08 shunters.
- Kerry Shale ('Arry (UK/US (14th series onwards)))
- Harry and Bert are not quite identical: Bert has more stubble.
- Harry and Bert were made into CGI for the CGI test episode, Thomas and the Stinky Cheese.
- The 1998 The Official Website called Harry and Bert "the Diesels".