'Arry and Bert are two very troublesome diesel shunters. Bert is known as Iron Bert whereas 'Arry is known as Iron 'Arry. They were the 2nd antagonists of Keekre24's Series. They are also two of Diesel 10's minions; They plan to Scrap Steamies at The Scrapyards. Their first appearance is Wilbert to the Rescue in Keekre24's Series. They are two diesels who sleep in the Diesel Sheds along with "Devious" Diesel and Norman.
- Season 11: Fergus' Day Off (cameo), The Great Western Way (cameo), Duncan in the Dumps ('Arry only; does not speak), Hank and the Hatt St Crossing ('Arry only; cameo), Spencer Goes Too Far ('Arry or Bert cameo) and Trembling Trevor
- Season 14: Freddie at the Ready (cameo) and Dirty ‘Arry
- Season 15: Roundhouse Roulette (cameo), Polar Express Coming Through! Arry or Bert (cameo), A Christmas Caroline (does not speak).
They have the same shape as Splatter and Dodge.