Open coach body for narrow gauge tipper wagon chassis

thingiverse

This is an 'open coach' body to fit the chassis of a 32mm gauge Hudson Tipper Wagon from [Binnie Engineering](http://www.colinbinnie.com/binnie_engineering.pdf). It is based on a 1969 photograph from the Leighton Buzzard Light Railway found on [this web page](https://www.irsociety.co.uk/Archives/48/Jubilee.htm). Because the original 'coaches' still had the tipper wagon end frames in place, it is possible to make a model where the new body is removable - so the chassis can be used either as a coach or as a tipper wagon as required. I really like the Binnie Engineering Tipper Wagons and run several of them, but have found them to be a little light and prone to derailing. Unloaded skips can also tend to bounce off the chassis. A couple of small modifications can help address this. Filling the underside of the main spine of the chassis U-section with lead epoxied in placed makes the wagons significantly more stable. Of course lead is toxic, so ensure that it is fully encapsulated in epoxy if you do this. Secondly, there is just enough space to fit small (3mm x 1mm) rare earth magnets to help hold the skips in place. The body of the skip itself is just thick enough to make a 1mm deep hole (using a 3mm end mill rather than an ordinary drill - the point will go through!) into which the magnet can be epoxied, just under the flange which rests on the chassis. A corresponding magnet can be epoxied to the frame on the chassis. The positions of the magnets are highlighted in the 'parts' picture. Warning! - rare-earth magnets can be lethal if swallowed, so if you make this modification be sure to use epoxy adhesive (not cyanoacrylate) to fix the magnets, and make sure there is a fillet of adhesive around the edge of the magnets to hold them securely.