Big Boy Steam Locomotive 3D Model SW Design sldasm, sldprt source files provided The file is very large, over 100MB. The Big Boy steam locomotive features two sets of driving wheels arranged at the front and rear. Each set has eight driving wheels on four axles, plus non-powered leading or trailing wheels on two axles. The two sets of driving wheels have independent pistons and crank connecting rods and are connected by an articulated bogie, sharing a firebox. This type of locomotive is the largest in size, the most powerful, and has the most driving wheels in history.
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