My 1:27.7 scale engines are based on the simple and readily available Hornby 0-4-0 mechanism or 'Smokey Joe' model. In this case the chassis was shortened and the Hornby hook couplings were removed, this is a simple procedure as the plastic is easily cut with a modelling knife. I have added small sections of plastic card to the slide cylinders and crammed any openings with sections of lead which is held in place with superglue.
Other than that, the chassis is an untouched Made In China Hornby 0-4-0 model.
The new body was constructed from plastic card, some scrap wood (the buffers) and odd pieces from my 'spares box'.
I kept checking back to ensure that the loading gauge was the same as my earlier engines and that the model would fit into the tunnel entrances on the layout.
The free-lance, vertical boilered engine is 95mm long x 54mm wide and 92mm tall to the top of the spark arresting chimney (which was cut from a toy train).