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Harry and Bert (also known as Iron 'Arry and Iron Bert) are two diesel shunters who work at the smelters and scrapyards of the Sodor Ironworks. They first appeared in the Railside Tales episode, Diesel's Steel Gang where they visited Bluthsburg Steelworks with Diesel to help Phoebe and Ralph.
Harry and Bert were temporarily brought to Crotoonia for a month-long period to assist with the backlog of deliveries at the Bluthsburg Steelworks. They gave a rude first impression by mocking Thomas first, followed by Ralph getting a "rusty little matchbox on rails for a boss".
They did prove to be of assistance when taking care of work in the yards, but continued to play cruel pranks on the other engines. Pheobe, having enough of their pranks towards the other engines, decided to pay them out by riling them up by ignoring them and sarcastically giving them into their own tricks; Bert trying to spray her with water got himself soaked, and Diesel was bashed by his own force when trying to bump her.
In anger, Diesel orders next morning that the three take a heavy freight train to prove their capabilities. They're sent on an express freight run to Fausten, but ignore warnings of the busy Bluthsburg West Junction and the Troublesome Trucks looking to get their revenge.
As the three entered the junction, they found themselves shoved by the freight cars at a ridiculous speed and are forced into Alayah's freight train, derailing them on impact. Eventually, the breakdown gang gets them onto flatbed trucks to be driven to the works (along with rerailing the derailed wagons), but not before Pheobe teases them for their arrogant attitude; she and Thomas end up hauling their Fausten run themselves.
Shortly after being repaired, the two diesels returned to Sodor.
Harry and Bert are based on BR Class 08 diesel-electric shunters. Over seventy members of this class survive today in preservation, while around 100 remain in service on the national rail network. They were in fact the most successful shunting engines in the world, with 996 of them built. Ruth, Diesel, Splatter and Dodge are also members of this class.
'Arry and Bert are painted green-grey with yellow hazard stripes on their fronts with yellow cabs. They have "Sodor Ironworks" written on their sides in white.