With thanks to Tebee for the original STL, this is a 'Work in progress' broken down version for "kit" assembly better suited for FDM printers. I've also added a bogie design for standard 6mm wheels on pointed axles. and a rear light. It is hoped to electrify the carriage for internal lighting and a 3mm red led tail light. I have included initial sketches for powering the bogies using copper sheet cut and heat staked onto the bogie with a soldered power wire.