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This model is of the Furness Railway's 0-4-0st, built in the 1860s by Sharp Stewart. It is recommended to scratchbuild a chassis, as 3D printed ones don't tend to work well, but I will consider provinding the 3D printed chassis model if asked.
Please note: rivet detail is unlikely to be present on White Versatile materials as the resolution of the printing process is too low to manage these details. The photo of the assembled 4mm scale loco uses a resin body print, higher detail than the materials available from Shapeways.