Trains are complicated machines, especially steam-powered locomotives, which are a blend of smooth metal curves and a myriad of moving parts. Capturing this magical combination of sleek and mechanical details at a small scale can come down to a single part choice, and Niklas Rosén has really done it with his micro-model built around this Technic spring-loaded shooter. The curved lines along the side are reminiscent of riveted sections on the boiler. Meanwhile, the creation is finished off with a pair of driving wheels represented by hubcaps from the Speed Champions theme, and the smaller wheels are represented by printed 1×1 round tiles.