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The Märklin Engine is an off the shelf gauge 1 model used to haul rolling stock in the background of the first season for the sake of creating the illusion of business. It is a German Federal Railways 80 class 0-6-0 tank engine first produced by the German model railway maker Märklin in 1971.
The Märklin Engine was first acknowledged in the crew members' dedication page on the Sodor Island Fansite. The page featured a behind the scenes photograph of the Märklin engine from the episode Tenders and Turntables. It then appeared on screen in The Flying Kipper in the background shunting and preparing the Flying Kipper for Henry to take away. The Märklin engine also appeared in Off the Rails and was used as one of the tarped engines in Trouble in the Shed. It can also be seen in a still from Thomas' Train pulling a small goods train next to Henry at Knapford.
When the second season started production, the Märklin engine was no longer needed and other engines were used to haul rolling stock in the background. Because of this, the model was presumably cut up and used as set dressing. A scrap smokebox of the Märklin engine later appeared at Crocks Scrap Yard in Edward, Trevor and the Really Useful Party, the numbering and lettering was still visible on the model's smokebox door. A Marklin BR 80 chassis was later used to push trucks along and is visible in Put Upon Percy and Busy Going Backwards.