Donald and Douglas are Two BLACK Engines from Scotland
Thomas & Friends
Donald and Douglas work together practically all the time, but they sometimes have a falling out. This was proven when the two crashed into Trevor's hay cart. Donald accused Douglas of pushing him into the cart while Douglas accused Donald of pulling him. The twins refused to speak to each other. When Duck needed help at the Sodor Ironworks, Donald took the opportunity to get away from Douglas. While Douglas missed his twin and was ready to makeup, Donald began to experience lapses incompetence and demanded an apology. Eventually, Donald was not looking where he was going and crashed through some buffers into a ditch. As soon as Douglas heard from Duck that Donald was in trouble, he immediately rushed over to help his twin and the two engines made up.
Later, Callan Castle was to be reopened by Lord Callan, so Donald and Douglas took some equipment up to the castle. The two argued whether or not the monster inside the lake existed or not. Unfortunately for the twins, a landslide occurs and the two became stranded. The Fat Controller promised help, but soon night came. The twins saw a shape moving towards them on the causeway. Donald and Douglas were petrified until they realised it was only Harvey who had come to help. Soon, the twins got their equipment to the castle on time and Lord Callan called them Really Useful engines.
In the eleventh series, some points were jammed and Gordon was sent to pick up the engineer to mend them, but instead picked up the carpenter. Gordon reversed to Abbey hoping to collect the engineer, but Douglas was in the way. Gordon decided that Douglas should go to Wellsworth and Donald to go to Maron to collect the engineer and Donald bring him to Douglas and Douglas bring him back to Gordon. The plan was carried out and the points were fixed; Gordon thanked the twins for helping him.
Afterwards, Harvey was sent to help the twins after a tree had been knocked down. Thomas, however, misunderstood the situation and accidentally sent Harvey the wrong way. Thomas was proud of himself for being so helpful until he saw that Donald and Douglas were stuck and needed Harvey's help. He found Harvey and gave him the correct directions needed to help the twins. Thanks to Thomas and Harvey, the line was cleared and the twins were on their way.
The twins later helped with the construction of the Harwick Branch Line, delivering most of the heavy construction materials. When Douglas went over the unstable trackbed that hides the tunnel into Calles Cavern it began to crack and the workmen only just stopped Donald from going over it. The twins witnessed Rocky lifting Captain Calles' Pirate Ship out of the cavern and helped deliver it to Arlesburgh Harbour. They later attended the branch line's opening ceremony.
Once, they were to clear snow from the tracks during winter, but they kept arguing over which tracks to clear next. Douglas was accidentally separated from his tender and left behind by Donald, who eventually found him in a siding with some help from Toby.
Donald and Douglas were among the engines who asked The Fat Controller to take them to the Great Railway Show, but they were not chosen.
Another snowy day, they had to take a large shipment of pipes to Vicarstown and Emily came along to help. During the journey, Douglas told Emily about some of Donald's accidents and she began laughing, which Donald could hear echoing through the pipes. Irritated, Donald stopped the train and got Douglas to take his place at the front. As they continued, Donald began telling Emily about Douglas' accidents, until Douglas stopped the train on Gordon's Hill and demanded that he and his brother swap back. With both twins uncoupled and busy squabbling and bumping each other, Emily was left holding the train on her own. They did not notice till too late that Emily and the train were slipping back down the hill - to make matters worse, a lump of coal shaken out of Donald's tender by a bump from Douglas had formed a giant snowball, which knocked Emily off the rails. Donald and Douglas instantly began arguing whose fault the accident was until Emily cut in and scolded them both for their behaviour. After Harvey had cleared away the mess, both twins took the rear of the train while Emily took the front and they reached Vicarstown without any further trouble.
Donald and Douglas were later seen at Knapford Station with Philip, Diesel, Emily, Gordon, Duck, Henry, James, Edward, Percy, Daisy, Oliver, Mr. Percival and Toby to welcome Thomas and his newest friend Nia to Sodor following the pair's adventure around the world.
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