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Micro Rubber Engines are a range of engines that are moulded out of rubber. The wheels do not move, and the engines are hollow. They are only available in My Busy Books.
- Toby and Mavis are incorrectly depicted as 0-4-0s, and Spencer is depicted as a 4-4-2.
- Rosie, Emily, and Whiff are somewhat oversized compared to the other engines.