Another nice little loco that is designed to fit the Bachmann "N" Percy chassis. This is the Festiniog Railway George England 0-4-0T+T Locomotive 'The Princess' from c.1875; the 3D print is designed by Mountainer Models and available on Shapeways. They have a range of these locos to choose from.
(https://i.imgur.com/W5A91Nw.jpg)
The Shapeways page includes useful instructions on completing the model. It needs a crew, of course; I found a couple of likely lads in my spares box - workmen from Langley's.
The side tanks are filled with lead sheet for weight and the tender has a small piece stuck to the underside. The loco weighs 37g