This 6w railcar is modeled after the SWEG VT BR650.
The instructions use a PF-Train motor and a BuWizz as power source, but other solutions should work as well. It uses some more advanced techniques, so I wouldn’t recommend it to beginners.
I haven’t testbuild this model in real life, if you decide to build it, feel free to confirm if it’s working as intended or report any issues. I suppose it is able of going through R40 curves, but I can’t guarantee that.
Partslist can be found on the last pages of the PDF-instructions.