Narrow Gauge Powered Bogie Set

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I designed this bogie set to be compatible with my model railway gauge, which I'm using for my stop motion mine trolley and truck. At this scale, the track gauge is 36mm between the inside edges of the rails. These bogie sets will also be used in other projects, but as a standalone project, they might be useful to others. A single bogie measures 62mm wide, 80mm long, and 25mm high. I based the details on numerous powered bogies from railcars and diesel locomotives. My goal was to create a bogie set that looked plausible and had an electrical drive arrangement. The models here include a Blender model created in Blender 2.58, so you won't encounter any issues using it with Blender's 2.5+ versions. To assemble the bogie sets, you'll need some ø4mm rod of any type, an M4 nut and bolt, and wooden dowel for the axles, which are approximately 54mm long. The nut should be installed in the top cross spar early on, glued into its socket if possible. You won't need additional support, as there are break-off bits on a few motor components. The filenames indicate how many times you'll need to print each bit.